Jimmy Fallon [1] and Ricky Gervais played a game of Word Sneak on The Tonight Show on Monday, cracking each other up as they tried to casually incorporate different words into conversation. Ricky joked about stopping by an Irish pub, "Shaquille O'Neal's," while Jimmy nonchalantly started talking about Spanx. Although Ricky had the late-night host doubled over at one point, it was Jimmy who brought big laughs when he shared the nickname of a certain body part. Watch the pair's funny back-and-forth above!