For me it’s driving while under the influence. If you couldn’t tell, I like me some ganja. However I have long since held the belief that it is utterly insane to drive while under the influence of most substances, with maybe nicotine and caffeine being the exception. All too often I see other stoners smoking and driving, which I simply can’t fathom. I’ve only operated a vehicle once under the influence and it was just to move a U-Haul around the block to a different parking spot, which was such a scary experience while high that I refuse to even consider getting behind the wheel again while high.
One of my hobbies is the social deduction game Blood on the Clocktower. Heavy social deduction games will draw certain types of people. Many of the people are very nice and inclusive. Others not so much.
I just played a game with a new group the other night - games usually take about 90 minutes in my experience. These people are all about playing super optimally rather than having fun. I made a sub-optimal play as an evil character, solely to create chaos. This led to mass confusion toward the end of the game. When my play was revealed at the end, people were literally yelling at me.
No one cared that it worked, and evil won, and that I completely followed the rules. I just did something no one would expect because I knew it would cause confusion. Some people take all the fun out of the game.