12 Times Jimmy Fallon, Notorious Giggler, Lost It on Saturday Night Live

If you've tuned in to The Tonight Show, you know that Jimmy Fallon is prone to giggle fits, whether he's watching Taylor Swift cry over a banana or doing a ridiculous commercial with Jessica Biel. But his easy laughter came long before his hosting gig — you can see it in action when he frequently broke character as a cast member on Saturday Night Live (yes, even more than Bill Hader as Stefon). You can't always blame him though. It's probably hard to keep it together when Will Ferrell does something utterly ridiculous, whether he's a posh department store manager in "Jeffrey's" or a horny guy in a hot tub in "The Love-ahs With Barbara and Dave." From conspicuous mouth twitching to hysterical laughter, here are all the times that Jimmy broke on SNL!