Some good ones from my buddy, Slick:
Q: Why do men’s clothes have buttons on the right while women’s clothes have buttons on the left?
A: When buttons were invented, they were very expensive and worn primarily by the rich. Since most people are right-handed, it is easier to push buttons on the right through holes on the left. Because wealthy women were dressed by maids, dressmakers put the buttons on the maid’s right! And that’s where women’s buttons have remained since.
Q: Why do ships and aircraft use ‘mayday’ as their call for help?
A: This comes from the French word m’aidez -meaning ‘help me’ — and is pronounced, approximately, ‘mayday.’
Q: Why are zero scores in tennis called ‘love’?
A: In France , where tennis became popular, round zero on the scoreboard looked like an egg and was called ‘l’oeuf,’ which is French for ‘egg.’ When tennis was introduced in the US , Americans (mis)pronounced it ‘love.’
Q. Why do X’s at the end of a letter signify kisses?
A: In the Middle Ages, when many people were unable to read or write, documents were often signed using an X. Kissing the X represented an oath to fulfill obligations specified in the document. The X and the kiss eventually became synonymous.
Q: Why is shifting responsibility to someone else called ‘passing the buck’?
A: In card games, it was once customary to pass an item, called a buck, from player to player to indicate whose turn it was to deal. If a player did not wish to assume the responsibility of dealing,he would ‘pass the buck’ to the next player.