Tension level when you're just about to get killed and spamming the Nexus key when the screen suddenly pauses not knowing if you made it or not: IMPOSSIBRU
Following ice635's post, I also have some ideas: Chainsaw, Fan, Hand Grenade, Smoke Grenade, Treadmill (or conveyor belt), Proximity Mines, Darts, Wheelbarrow, Dog or Cat (Preferably that moves about), Black Hole (Or some sort of device that pulls stuff in), Wood Chipper, Snazzy Hat (Or Top Hat), Glue, Boomerang, Slingshot, Bow, Wand/Staff (That fires magical blasts or something), Flamethrower, Lightning, Vacuum, Claymore (The explosive kind) Etc, Etc.
Exp tip: Find a massive cluster of players and follow them, you get exp even if you do nothing as long that you stay near the guy/s that killed whatever they killed.