I usually only show my cards if it helps to push an image that is really the OPPOSITE of how I usually play.

For instance I'm usually tight-agressive, I'll bluff if I have a good read on the opponent though. But more often than not, I'd say I have the goods. So, something I always try to do when I sit down at a game...find someone I can easily bluff. I'll try and bluff him out early, and then I'll show my cards.

When I do this early, people tend to get a different impression of me, and it helps me to get betters when I go back to my tight style.