The annual Montana Testicle Festival.

Here is a little ''Trick'' I once saw on the Cary Grant, Mr.Blandings
Builds His Dreamhouse movie.

Get a picture frame, one that you know is square at the corners.Hold the
picture frame in one hand and a level on top of the picture frame with
your other hand.Eyeball the houses in your neighborhood and see how much
out of plumb those houses are.
cuhulin