I've actually dealt to one specific idiot that was playing $5k a hand and made the following plays:

Doubled on a blackjack against a dealer's 9 (not that the dealer's card would make a difference in the fact that this is a stupid move)

Dealer has a 8, he has 5 & 2 (7). He stays. STAYS ON SEVEN!!! against a dealer's 8.

Problem with BOTH of these moves...HE WON!!!

This guy won $15,000 on 2 VERY stupid moves. Kinda hard to tell him that they were dumb moves when the win involves an amount close to half of your annual salary, huh?