Spear Stairs (Trap Idea)
Here's one for you DM's that need some good old fashion stair traps. The Players are planning to go up some dungeon stairs when SHINK, SHINK-SHINKA, SHINK, spears start coming out of every which way (as in the sides, floor, & the roof [provided that thee dungeon has a low enough roof]) from the stairs. The Player will now either have to find a way though the spikes, find a way to stop the spikes, or find a way around the spike.