While I'm a bit late for this node, I'd like to point out to the C program tattooes mentioned in the IOCCC News.

• 26 February 2005: David Edney was the first person to point out that he has a tattoo of the 1994/smr.c winner on his forehead.
• 18 January 2005: Thomas Scovell becomes the first person get a tattoo of a non-empty IOCCC winner (1984/anonymous.c).

On a slightly different kind of programming tattoo, see export-a-crypto-system sig.