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1.
When you wake up early in the morning to feel the urge to excrete faecial matter and end up stuck halfway down the toilet bowl.

The pre-dominant factor is zombie fatigue however various other causes have also affected a people such as:
She was three-quarters zombie when she awoke, her brain wasn't functioning properly.

He hit the door on the way in.

She was too worried about the stubbed toe she got.

He simply forgot to put the seat down.

They all had a Toilet Drop
by An unfortunate incident January 04, 2011