h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Regardless of what statisticians may tell you, when two options are presented to you, you will always choose the wrong one. This is particularly the case with swing doors - if it should be pulled open you'll push it first. The risk to the individual in question directly proportional to the number of people on hand to see them make a fool of themselves.

This works especially well with Minesweeper in Windows. You get down to the last 4 squares in 'Expert' mode, and either way will fit the numbers you have uncovered. Guess which option you ALWAYS choose?

Unless of course you happen to demonstrate this to a friend to show how unfair life is. Mind you (getting severely paranoid here), if you RELY on this latter effect, it won't work.

Unless you're a statician, who is somehow immune to this effect...