I like the back-print that says "I'm a bomb disposal expert - if you see me running, try to keep up!", and my all-time favourite was worn by a tot in a pram, saying "Teething - it's the pits!"
in very small letters on the front, you have to get close up to read them it says...."nosy little bitch arent you?"
and another, "your village called, their idiot is missing"
my two favourites not yet mentioned are ..
'hold my beer wjile I kiss your girlfriend' and the one oft worn by my very Goth friend 'I'm only wearing black until they invent a darker colour'
However the one thing that makes the bomb technician T shirt even funnier is that now it has become a mass produced tourist item in Camden market, they printed it on the *front* of the shirt!!