As Greg Grunberg explained - and then showed us with a series of homemade videos - the Heroes cast goofs around a lot on set.

And it hasn't taken newcomer Kristen Bell very long to catch on to the good-natured vibe. In the following funny pictures, Bell takes a break from portraying the evil character of Elle and makes us laugh with her expressions:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.