I've got a t-shirt that says:

I wished for a blessed +3 GDSM
and all I got was this lousy t-shirt
For all you non-hackers out there, this joke refers to the fact that, although you can wish för such an item, there's always a chance that you don't get exactly what you wished for.

The shirt was made by someone (I forget who) on rec.games.roguelike.nethack, a couple of years back and sold to me through mail. As far as I understood there were perhaps fifty of them made altogether.