I would like to have more silly dungeons where some stuff happens at random and out of your control but doesn't cause death, more like a nuisance but that you can laugh about.

Like being randomly pushed to a side, OR make yourself be pushed like a ping pong to unlock some door/passage/reach a coffer... maybe thats the only way to reach an area: by being pushed into it... but you have to trigger it, make yourself be pushed or a party member push you.
Maybe the last member cannot be pushed and will be forced to take the long way around (there should not be enemies there, or they should be very low level, a coffer is ok).

Paint fights... being attacked by something that colors your whole character and it probably causes you to walk slow, or maybe you actually need to be covered in certain paint to open a door or something.

Better yet if they put a contraption that shoots paint/wind balls so that you can shoot your party members, or shoot each other and probably waste the rest of the dungeon time running around painting/pushing each other.

Mount races !!
Give us a temporal mount that we have to use to run away from something chasing us. If we get certain damage we lose our mount. We can attempt to sprint but most likely die. Once at least one party member reach the end of the track, a save point will be created so other party members can teleport/respawn to it.