Captain America: Civil War is about to start filming, but the actors involved in the film are already starting to get into character.

Earlier today, Evans shared a simple thought with his Twitter followers. Evans wrote, “Don't underestimate the benefit of awe. Take time to be amazed by things. By anything. By everything.”

In response to Evan’s tweet, fellow actor Frank Grillo wrote, “I'm amazed at the ass whoopin you got coming. X.”

Evans responded, “I'm amazed you can read. Be honest, your kids are helping you sound out the words.”

Not one to let Evans have the last word, Grillo replied, “I can read the hospital report for you after wake up from that that little snooze your gonna take hero boy.”

@ChrisEvans I can read the hospital report for you after wake up from that that little snooze your gonna take hero boy. — frank grillo (@FrankGrillo) May 7, 2015

However, this heated exchange isn’t the latest celebrity feud brewing. Chris Evans plays superhero hero Captain America, and Frank Grillo plays the villain Crossbones. The two are set to square off against one another in the upcoming Captain America: Civil War.

Captain America: Civil War is scheduled to be released in movie theaters on May 6, 2016.