You have the rope around your neck and can kick the chair out from under yourself at any moment.
You're driving down the road, all it would take is one jerk of the wheel to send you into on-comming traffic.
You walk by yourself at night in a bad part of town. Danger is everywhere.
You're defusing a bomb, one cut of the wrong wire and it will explode, taking everyone in a 100 yard radius with it.
You just bought a hot dog but have bitten off more than you can chew. You begin to choke.