UFC 178 weigh-in photos Irish fans get ready to cheer on Conor McGregor during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-ins Irish fans get ready for Conor McGregor during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-ins Irish fans gets ready for Conor McGregor during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-ins Cody Gibson poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-ins Manvel Gamburyan makes weight during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-ins Manny Gamburyan and Cody Gibson square off during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-ins Kevin Lee poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-ins Jon Tuck poses after making weight during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Jon Tuck and Kevin Lee square off during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Brian Ebersole celebrates making weight during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos John Howard flexes after making weight during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos John Howard and Brian Ebersole square off during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Stephen Thompson poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Patrick Cote salutes the crowd during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Patrick Cote and Stephen Thompson create a classic pose during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-ins James Krause poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Jorge Masvidal makes weight during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Jorge Masvidal and James Krause square off during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Takeya Mizugaki poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Dominick Cruz poses after making weight during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Dominick Cruz and Takeya Mizugaki square off during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Amanda Nunes poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Cat Zingano poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Cat Zingano and Amanda Nunes square off during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Dana White separates Zingano and Nunes during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Yoel Romero poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Tim Kennedy poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Tim Kennedy and Yoel Romero square off during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Conor McGregor screams during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Dustin Poirier weighs in, and Conor McGregor poses, during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Dustin Poirier poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Dustin Poirier says "this is my house" during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Dustin Poirier and Conor McGregor have an intense showdown during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Dustin Poirier and Conor McGregor talk trash during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Dustin Poirier and Conor McGregor have to be separated during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Eddie Alvarez flexes during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Donald Cerrone makes weight during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Donald Cerrone and Eddie Alvarez square off during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Chris Cariaso poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.

UFC 178 weigh-in photos Demetrious Johnson poses during the UFC 178 weigh-ins Friday afternoon at the MGM Grand Garden Arena in Las Vegas, Nev.