Lisa Kudrow and Conan O'Brien have quite a few things in common. They're both 47. They're both funny. And ... yeah, that's all we can come up with too. But apparently, back in the day, they used to date! In fact, Lisa recently revealed to More magazine that Conan is, in part, responsible for her career. The two met and had an instant attraction. While Lisa was considering giving up on comedy, Conan encouraged her to keep on trucking. But it wasn't enough to keep them together. "He was really smart, really funny and he thought I was funny. But we found we were better as friends," explains Lisa. Sigh. [NY Daily News] This isn't the first time we've found out that two celebs dated behind our backs before they rose to fame. After the jump, we scrounged up some of the most random celebrity hookups we didn't know about.