Drop Floor (trap idea)
Here's one for you DM's that want to miss lead their players into somewhere else. The player have walked into a stunningly furnished room. As the players walk in the room, they will be filled with a great scent of flowers, chocolates & wine. In the room are multiple lounging chairs & couches. Everything in the room should invite the player to sit & rest awhile. If the players do stay & rest in the room awhile, they will hear something break from under them. Suddenly the floor will fall out, & the players must make a dex save to not fall with it. Those who fail will fall to a lower floor of the dungeon [taking fall damage] & then will have to find some place to escape the falling furniture from hitting them.