Worst ways to wake up:

Anyone who's ever had a dog or cat knows the annoyances of a sudden quadrupedal visitor in the night. "Fido, go away, I'm sleeping," you mutter grumpily as he tries to burrow into your bed.

Then you wake up a teeny bit more and realize it's not Fido or Fluffy but rather a wild leopard.

Huh. Well, that's certainly a way to jump-start your day with a kick of adrenaline.