That you could put your wedding ring on the table and say all in mofo!

That anyone ever, in any serious poker context whatsoever, would string-bet. It annoys me to no end that virtually every movie or tv-show with a poker scene involves: "I see your $100.......................AND RAISE YOU $200!!". Bah.

@DanMcArdle thats my only strategy

Good question! I had a few.....

1) that people were as good as they said they were
2) that dealers were experts at playing poker
3) that if I was all in for $20 but an opponent had $100, I could still win his $100
4) that after my first ever session, where I won, that I was a natural and could never lose
5) that any 2 cards had the same odds of winning, because no hands are made until the flop hits

I always thought that 5 card draw and 5 card stud were real, but have never seen them ever played in a real casino.