Jesse Eisenberg

I tend to be pessimistic about everything: If things seem to be going good, I'm worried that it's going to end; if things are bad, then I'm worried that it's going to be permanent. It's not a very comfortable attitude to have all the time.

I guess the more serious you play something, if the context is funny, then it will be funny and it doesn't really require you to be necessarily, explicitly humorous, or silly.