For those who don't know who Zach is, he's "Allen" in the movie "The Hangover".
Earlier in his career, he was a comic and very funny one at that.
Here's a show that he did called "between two ferns" and this was an interview with Charlize Theron. FAH!
After, check for others, many other funny great interviews with other popular actors, like Ben Stiller, and Natale Portman.