"you see a massive stone door withintricate symbols on it"
"i push the door"
"it doesn't open"
"OH, HAHA, NICE GAG, GM, I'VE NEVER HEARD THIS ONE BEFORE, I GUESS I'LL PULL THEN"
"you pull the door, its hinges snap and falls over you, roll to avoid getting crushed"
i did this once, was bretty fun, it was in a room that was already full of (very simple and easily detectable traps) should've inspected the symbols
(another trap in the very same room that im proud of is having a bust with a magical necklace on the opposite side of the room, with two dart traps built into it, one coming from the side that is very obvious to the point where i just told them outright, the other just slightly less obvious so they'll have to search for it, but with a very low DC. the obvious one would only hit if you strand right infront of the bust, while the slightly more hidden one got a clear shot from this side to the door on the other side, (so the monk with the stick that didn't bother actully checking for traps still gets shot at, and if it misses, the dude who's screaming at the ceiling for not being able to push open a door get hit instead