Here’s one for you DM’s that want a funny, crushing trap.
The players enter an abandoned barricaded building. As they explore they find a great many barcades on practically everything. Except they will find a door that has not been baraced, or noticable touched. If one of the players try to push the door open, it won’t open.
But if they pull the door open, it will open cleanly. After that they should notice a large amount of objects that were learning on the door to stop it from being pushed in (which it couldn’t even do in the first place, even with the barricade their), will start to fall out. Have the door opener roll a dex check, & on a fail they will become stuck under the stuff & take 1d4 damage.