Jeremy Piven Pranks 'Tonight Show' Intern Over Sushi (VIDEO)

Temper tantrums among the supposedly "grown-up" Hollywood set are so commonplace these days, it'd be hard for anyone working amid all that drama to realize they were being punk'd. On 'The Tonight Show' (weeknights, 11:35PM ET on NBC), poor Eric, an NBC page, was on the receiving end of Jeremy Piven's (feigned) enraged reaction to being served a plate of sushi back in the green room.

"I got mercury poisoning, you know that right?" Piven asks the intern. "You think that's funny? I almost [beep] died!" The actor starts cussing, kicking furniture and throwing things. Later backstage, Piven says to Eric, "I don't know if I can hold it together, and it kind of is your fault," before chucking a glass of water in his face.

Eventually, Piven reveals that it was all a giant practical joke, and the reward for Eric's pain is the chance to appear on 'Entourage' -- under one condition...