I thought it was hysterical when Jerry was saying he remembered the date of the last time he threw up (June 29, 1980?), and then had to "break" his non-vomiting string in "The Dinner Party" episode! What was the episode where he was originally discussing that strange topic? I remember Jerry saying how his "dry-heaves" in 1989 don't count, and that his previous time before last was ALSO June 29 in 1974. There was also "The Pitch" episode where Kramer throws up on Susan, and Jerry says that "It's a very traumatic thing to be thrown up on." (Talk about a show about nothing!)
This may sound totally crazy, but I know the dates of the last five times I've thrown up.
8/28/94 (first day at college) 4/17/93 (friend's party) 4/25/87 (last time w/o alcohol) 2/06/82 11/1/81
BTW, I almost broke my non-vomiting string last Saturday as well as this afternoon. Hope I can make it to 14 years!