Lots. Like, lots. Most recently, getting a platinum trophy in Just Cause 2 a couple of months ago. The platinum flashed on screen after so much playing and I hated myself for it.

Also, I feel compelled to finish nearly every game I start. It's really a sickness. Lately I've gotten into the habit of outright deleting save games so that I don't feel compelled to put the time in to see them through to the end.