I almost never show. Like everyone else, why give information when you don't have to... unless it's misinformation.
Recently in a tourney I got an incredible run of strong opening hands that kept connecting with the flop when we got one. So my opponents kept seeing huge and pretty constant aggression from me. My VPIP was probably 45% or so. At one point I had opened with 10/10, the flop came A/10/4 and the other guy donk bet into me. I reraised him which would have put him all in, which pushed him off the hand, and decided to show a 10. I wasn't being a wild man or bully... I was actually playing a pretty tight range, but I wanted people to think I was a wild man, and start pushing back at me with a wider range so I could exploit my inaccurate table image.
I guess my point is that there is an exception to every rule.