One of my first gaming experiences was a Rolemaster campaign that kicked off in '88. I met someone in my local FLGS and he invited me in. This was my first session with this group. Turns out it was a Rolemaster campaign.
The Warlock rolled 'Animal friend' on the backgound chart, and generated 'horses'. In the mind of the player in question (an odd one at best) this become very.. dark. It led to a series of episodes where he would sneak out to the stables with a stool and... I'll leave the rest blank.
I can assure you that that particular player (and that group) certainly didnt fade to black either. There was no topic too dark for this group.
Oddly, the same player was an avowed Satanist, and would greet you (if you tried to wake him before midday) by hurling a large heavy knife at you as hard as he could. He was also a pyromaniac (NEVER ask him for a lighter, and always use them away from your face - he 'tinkered' with them so they all produced flames at least a foot high and with the intensity of the sun).
And yes, I meant 'player'. The guy was seriously unhinged. A great guy though, but a total whackjob.
On my third session, I woke up sticky taped to some childrens play equipment across the road. If you fell asleep during the session this would happen (eyebrows were also not safe, and you were lucky to just be drawn on).
Bear in mind I was 14 at the time and they were all 18ish.
Oddly, this turned out to be the best roleplaying group I ever played with. We played together every weekend for 5 years. All nighters on Friday, and all weekend long. All my best RP stories come from this group.
Go figure.