You never know what’ll happen when two fighters face off with each other. Check out these photos through the years that highlight instances when UFC president Dana White had to step in to keep the peace.

B.J. Penn and Nick Diaz (UFC 137)

Georges St-Pierre and Nick Diaz (UFC 158)

Anderson Silva and Chris Weidman (UFC 162)

Dustin Poirier and Diego Brandao (UFC 168)

William-Macario and Neil Magny (UFC 179)

Jon Jones and Daniel Cormier (UFC 182)

Ian McCall and John Lineker (UFC 183)

Uriah Hall and Rafael Natal (UFC 187)

Chirs Weidman and Vitor Belfort (UFC 187)

Chad Mendes and Conor McGregor (UFC 189)

Ronda Rousey and Holly Holm (UFC 193)

Jose Aldo and Conor McGregor (UFC 194)

Cub Swanson and Doo-ho Choi (UFC 206)

Daniel Cormier and Jon Jones

Khabib Nurmagomedov vs. Tony Ferguson, UFC 209

Conor McGregor and Nate Diaz (UFC 196)

Conor McGregor and Nate Diaz (UFC 196)

Nate Diaz and Conor McGregor (UFC 202)

Nate Diaz and Conor McGregor (UFC 202)

Dominick Cruz and Cody Garbrandt (UFC 207)

Amanda Nunes and Ronda Rousey (UFC 207)

Jeremy Stephens and Renato Moicano (UFC on FOX 24)

Daniel Cormier and Jon Jones (UFC 214)

Joanna Jedrzejczyk and Rose Namajunas (UFC 217)

Jason Knight and Makwan Amirkhani (UFC Fight Night 130)

Rafael dos Anjos and Colby Covington (UFC 225)

Khabib Nurmagomedov and Conor McGregor (UFC 229)

Derrick Lewis and Alexander Volkov (UFC 229)

Khabib Nurmagomedov and Conor McGregor (UFC 229)

Jon Jones and Alexander Gustafsson

Derek Brunson and Israel Adesanya (UFC 230)

Diego Sanchez and Michael Chiesa (UFC 239)

Jorge Masvidal and Ben Askren (UFC 239)

Marc-Andre Barriault and Krzysztof Jotko (UFC 240)

Israel Adesanya and Yoel Romero (UFC 248)