black ice, or, the sheet of ice that you see on the sidewalk and think is not slippery and you proceed to walk on it and slip.
one crazy ass morning i was walking to the bus stop and i slipped on an ohshit.
The exact moment of realization that you have done something insanely stupid.
I just left my keys in the car with the engine running! Ohshit ohshit ohshit ohshit ohshit!!!