Why Colds Happen

Here is my theory on why we get colds.

Every once in a while, your brain gets tired. It needs a little break. So it wraps its self (and thus your entire head) up in a nice cuddly snot blanket. This explains why your ears and nose and throat are affected.
It also explains why you seem to think and process more slowly when you have a cold; it takes time for information to pass through the snot barrier, either to enter or exit.
Every time you blow your nose, a little bit of your brain's snot blanket is blown away, until finally there is almost no blanket left, and your brain becomes fully functional again.