Well, during an interview at Comic-Con 2015, the Hunger Games actor got pretty ticked off when he erroneously thought that a reporter mistook him for his Thor actor brother.
The interviewer introduces himself, "Hi, I'm Chris it's nice to meet you."
"Did you call me Chris? It's Liam. You called me Chris, didn't you?" the actor asks, visibly annoyed.
"No, I said I'm Chris not you," the interviewer responds, a bit shaken.
The two laugh it off and Liam gives him a little tug on the shoulder to communicate that everything is cool between them.