#7 Oh yes. Only a few times, but the Keeper was awesome. I could tell you stories....
I always played a detective, Sam Spade. And I played him to the hilt, as stereo typical as I could. Somebody asked me why I collecting evidence once, and I said "I'm a dick, see? It's what I do".
There was this scene when we where fighting a star vampire in Norway, and it was following us in my hot-rod. And we to this bridge over this huge chasm. So I punched a hole in my gastank and drove across the bridge. And when I got to the other side, I stepped out, and calmly tossed my zippo onto the trail of fuel. Note that star vampires are invisible unless you shine light on them, and it was nighttime, so I didn't take any sanity damage from that.
I did loose SAN the first first time it showed up. I saw these trees levitating from the forest and exploding in mid-air as it headed through the forest at high speed straight towards us. That's where one of the players the "best death" award for screaming "come and get you bastard", then cutting himself with a knife. He was an Australian reporter. Best field reporter death evar.
When it first got to the evil creepy Lookout Hotel type place we where staying at, and I saw the levitating exploding trees, I got into my hot-rod and grabbed my Thompson 45, ready for a real fight. Then it picked up my car. So I stupidly turned my lights on to see what it was I was actually fighting.
Pro note: in Call of Cthulhu, you do not actually want to see what you are fighting, because even the worlds best psychiatrists can never make you come to grips with that.
There are plenty of other scenes, too. That was the game where I learned you make napalm from 1ate 1920's common kitchen supplies.