Stairs & Booze Barrels (Trap idea)
Here's one for you DM's that want a trap that will catch your player's off guard. The players are having to climb up/down some stairs for progression in your dungeon. But soon enough they start to hear a falling sound coming from ahead of them or behind them. Soon enough, they will find a barrels full of booze are falling towards them, & they are about to roll right through by these barrels. Give your players a bit of time to try & figure out a way to 'disarm' this trap. After they succeed or fail at doing this (failing will cause them to take damage from getting crushed by some of the falling barrels), they might have to deal with another problem. Some of the barrels didn't fall down the stairs intact, & so, some if not most, of the stairs are now covered in booze. Tread carefully, & snuff out your torches, or an inferno will start & stay awhile, dealing some ticking fire damage.