The punchline from this Questionable Content webcomic is one of them.
“My favorite part was when you took on those four guys at once! And then that giant dog!”
Our gaming group and nearly all players of Catan independently discovered the classic “I’ve got wood for sheep!” years before BBT used it.
Another one, that I just heard of but didn’t experience, was about the naval game Cape Horn: if you invite someone to play it, say “Anyone up for some Cape Horn?” very slowly or it sounds like you’re inviting them to a different activity.
Playing end game of Rail Baron one evening, the person most likely to win got a card that caused her to exclaim, “Shreveport? **Nobody **goes to Shreeeeeveport!”