Sinking sand, bogs that you sink into, breaking lava crusts, rotten logs crossing fast flowing rivers that break at midpoint when walking across them
, nets that fling up as you step on the center, foothold traps that clamp on your leg (actually i would hate that), snares, giant web taps (have to light on fire to get loose, makes a use of actually having a torch), deadfall traps, I would enjoy seeing something like when exploring a dungeon you enter a room and accidentally trip a pressure plate that closes the doors and fills the room with a knockout gas, when passing out you see masked bandits coming in and caring you away, completely side tracking your current quest, when you wake up your somewhere completely foreign and the bandits are going through your stuff, what do you do? kill them and take your stuff back, Duh!, thats what i want to see, just saying!