This week marks the momentous occasion of 30 Rock's first live episode, and aside from the unpredictable, outrageous highlights we're bound to see, there's also a host of guest stars who'll be stopping by. Two of them include Jon Hamm and Matt Damon, a pair of Liz Lemon's love interests. Liz has had a pretty active dating life over the course of the show's five seasons, but somehow she's still ends up single. Here's why: each of her suitors seems to have a hilarious, (and sometimes horrifying) dealbreaker. Watch this video for clips of her past boyfriends — there's a solid lesson each man can teach us for what not to look for in a mate!