Yeah the poisoning and then subsequent car wreckage is pretty near impossible to top...
My worst date that I can think of was during college. I had a class with this one guy whom I liked, so I asked him out. I had tickets to see Jay Leno who was appearing at the University. I was hoping that the guy would offer to get a cup of coffee or something beforehand, but he didn't. Instead, we hung out at his apartment while he played video games with his friends, him bragging that *he* was going to Jay Leno and that he was going to heckle him.
After the show, we went back to his apartment and he played video games again, completely ignoring me. I mean, if he didn't like me, he should turned down the date, but I guess he selfishly just wanted to go to the show. What a putz.
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See? Doesn't top near death by lobster...ah well. =)