You can never do just one thing.

Whatever hits the fan will not be evenly distributed.

One of my favorites.

Never make a decision you can get someone else to make.

If you are early, it will be cancelled, If you knock yourself out to be on time, you will have to wait. If you wait, you will be too late.

At any particular time, there are more horse’s asses in the world than horses.

This one is one of my top choices of “Murphy’s Laws.”