The law.

There are many well known laws that apply to the real world that we live in. I think this is one of the largest and best collections known. Should you have some that are not included, please forward. Some examples:

Cornuelle's Law - Authority tends to assign jobs to those least able to do them.

Anthony's Law of the Workshop
Any tool, when dropped, will roll into the least accessible
corner of the workshop

Barber's Laws of Backpacking
3) The weight of your pack increases in direct proportion
to the amount of food you consume from it. If you
run out of food, the pack weight goes on increasing anyway.

The above also applies to dirty clothes. Any amount of clothes carried with you on a trip increases in weight by 10% per day in direct proportion to the nearest of the return date.

Boren's Laws
1) When in doubt, mumble.
2) When in trouble, delegate.
3) When in charge, ponder.

And my favorite:

Bilbo's Proverb
Never laugh at live dragons.