In the tomb of horrors, there is a door that summons a monster to attack the players if the players stab the door. This is apparently something that not only happens in Gary Gygax's campaigns, but happens often enough that he encoded it into one of the most famous dungeons of all time.

I am with this 99 % of the time. I have met the 1% DM sadly. He simply never shuts up to let his polite players input ideas