It's a well-known fact that Kristen Stewart isn't the most comfortable talk show guest around, but apparently when it comes to game shows, she's a natural. Last night on The Tonight Show, Jimmy Fallon disarmed the notoriously guarded Stewart by challenging her to a classic game of Word Blurt, a game where you are shown a word and then have to write the first thought that pops into your mind based on that word. "I'm not very good at the whole improv, joke thing," Stewart, who was promoting American Ultra, warned Fallon. We beg to differ. Watch it below.