Post it the first time you're a wit.
The second time, a half-wit. Arithmetric progression from there, eh?
You might want to buy one of these: http://cgi.ebay.com/How-to-have-a-sense-of-humor_W0QQitemZ120035376356QQihZ002QQcategoryZ378QQssPageNameZWDVWQQrdZ1QQcmdZViewItem