It was the worst mass shooting in U.S. history, and now we know exactly how it happened.
[Image via AP Images.]
Ch-ch-check out the video (above) to see Jimmy bring funny back as he promotes the highly anticipated Christmas episode!
BTW, if you're playing a drinking game where you take a shot every time someone says Justin Timberlake, you may want to call an ambulance before you hit play. LOLz!