After some past fiascoes (you should probably not click on that link), you’ll have to wait until after the jump to check out this t-shirt. It’s a visual metaphor that’s funny and pretty tame, unless you say it out loud.
Get this in black or white on a t-shirt for $18 here (2/3 of the way down the page).
[ Diesel Sweeties ]
http://www.botjunkie.com/2008/04/22/i-_-robots-t-shirt-potentially-nsfhumans/