In poker I often I see guys get extremely upset (like when they lose with pocket aces) at a loss, then throw money away trying to win it back with worse hands. My view is you have to see the bigger picture and realize you'll win and lose, you can't play well if you don't plan on the losses as part of the play. Just need to be smarter and win more than you lose. Sometimes cut your losses and run.. other times you have lots of outs (ways to win) and if you play the percentages you'll come out ahead.
(I think, the most common error in casinos (craps & other games) is to think just because you lost 4 in a row that you're bound to win the next throw so a person thinks they can increase their bets and win it all back on the next throw ... if you keep doubling up, you'll run out of money before the odds turn the game around.