He says, "This one gal was able to eject ping-pong balls at high velocities with amazing accuracy."

Bradley Cooper decided to join in the fun and asked Todd Phillips to take a photo of him with his mouth open, pretending to catch one of the balls - and the performance artist's aim was true.

He adds, "(It went) right in my mouth... (There are) Handi Wipes coming out from everywhere, (co-star) Ed Helms is throwing up... It was memorable."