Zach Galifianakis enjoys being an "a**hole" to fans.
The 'Hangover Part III' actor it is hilarious to run away from his teenage supporters, but he doesn't feel bad about it because even though they don't get to meet him, they will have a funny story to recall to their friends.
He said: "Bradley [Cooper] and the guys love it and all have good attitudes - they're professionals.
"But I'm just tongue-in-cheek. I think it's funny to run from teenagers and not be nice to them.
"Even if I'm playing a part, they'll have a good story to tell their friends, 'Zach Galifianakis was an a**hole!' "
The 44-year-old star also finds red carpet events funny because he doesn't understand why fans enjoying standing around for so long just to catch a glimpse of him and his co-stars.
He added: "I either giggle my whole way through it because I can't believe how bizarre it is or I just get agitated.
"It's never like, 'Oh, this is nice!' I find myself laughing so hard and thinking, 'Don't all these people have something better to do?' "
Tagged in Bradley Cooper Zach Galifianakis