Trap ideas for a mod I'm making

• Classic spike trap!
  Spikes come up from the ground, pretty much it!
• Flame thrower trap!
  Spews some kind of beam in a direction that inflicts burning! (or alternatively sets the blocks in front of it to fire if they're air)
• Dart projectile!
  Just an arrow that inflicts poison and slowness that can be fired out of a dispenser

Teleporter trap: A platform that is barely visible that when stepped on, teleports you to "tele-trap" dimension which you spawn in a dungeon/obstacle course where you need to find a way out of without mining. (Any mistake could lead to falling into deadly traps)

Funnily enough, I'm working on something similar. Some friendly advice: Unless you want to spend the next week of your life doing so, do not, under any circumstances, try to make lasers.