Thirteen

[excelsior-1]

A guy is walking past a big wooden fence at the insane asylum and he hears all the residents inside chanting, "Thirteen! Thirteen! Thirteen!"

Quite curious about this, he finds a hole in the fence, and looks in. Someone inside pokes him in the eye.

Then everyone inside the asylum starts chanting, "Fourteen! Fourteen! Fourteen!"

[Baldric]

Unlucky for some!