Possibly 18+During my trawling through various forums, I found a link to a site with old comic covers and strips that have dodgy overtones. I found some of them pretty hilarious:
http://www.super 
ery.com/seduction/3.html
The censored part is the word that begins with 'd' and ends in 'ick'.
Oh, and they're not edited in any way.
I did have some rather funny edited Spiderman ones, but the site with them on is currently changing servers.
Also, I was directed to these rather random links (18+):
Liquid Snake watches Solid Snake try to play golf.Super Hitler World (Mario World 'Spoof')The Captain Jean-Luc Picard song (WTF)'The Internet is for Porn' - A song by Sesame Street characters.The Pope is Dead, MGS style (WARNING - Tasteless)Don't flame me if you find them offensive - you can blame LUEsers (users of the secret LUE board at GameFAQs) for most of this content.
LUE, incidentally, is the infamous forum that has spawned or spread stupid fads like 'BANNINATED,' '*puts on robe and wizard hat*,' 'Y helo thar' and 'You bought an N-Gage, didn't you?'
For a full list of LUE fads, visit
this page.