Because they have BOOOOgers.
The guy overpacked, and the photon is traveling light.
Because umbrellas can't walk.
Because he had a stinking cold!
The phrase I went through a whole box of tissues watching that film. is a good place to start.
Weeaboo
Because they're always dead tired. I stole this from plain and simple. Just straight up stole it. Why? Because it made me laugh and I didn't see it posted here before.