If a straight line fit is required, obtain only two data points.
If all you have is a hammer, everything looks like a nail.
If an experiment works, you must be using the wrong equipment.
If an item is advertised as "under $50", you can bet it's not $19.95.
If anything can go wrong, it will.
If anything is used to its full potential, it will break.
If at first you do succeed, try to hide your astonishment.
If at first you don't succeed, blame it on your supervisor.
If at first you don't succeed, cheat!
If at first you don't succeed, destroy all evidence that you tried.