ok, you really have to have a broad sense of humour (and a pair of b**ls the size of coconuts to wear some of them), but some of them are hilarious!
http://www.tshirthell.com/hell.shtml
I got this shirt in austin and wore it to our gig last night…
It’s not “funny”..but I thought it was cool 
While learning a foreign language in ‘93 many of would wear tee shirts while running that represented the country that spoke the language we were studying. So now I have a tee shirt that says “proud of Afghanistan” with a map of Afghanistan silhouetted in the old flag colors. Don’t think I’ll wear that shirt any time soon.
One of the best I’ve seen is an extra-extra-extra-large guy in a tee-shirt bearing the slogan
“I beat anorexia”.
If you search for it on google images (search for “cure”) it’s on page three of their list, on this site:
gxpmall.bizland.com
but sad to say I am not permitted to look at it. You may not be permitted either. But you can see the thumbnail, which is good enough.