Okay - the one about your eyeballs popping out if you keep your eye open when you sneeze is false!

See:
http://www.straightdope.com/classics/a2_304.html

As an "allergic person" I have sneezed a LOT in my life - and have never, by the way, busted a rib. Maybe you have to have osteporosis AND sneeze really hard ...

And I DID lick my elbow. The inside of my elbow is still my elbow, right? I couldn't reach the outside, but I could reach the inside of my elbow!

Hah!