Machine language time code

The Machine language time code or simply the time code is a code appearing in a tattoo on Fry's butt.

The code
The code appearing in the film is as follows; 001100 010010 011110 100001 101101 110011

As you can tell, it is mirrored over the first three columns over to the last three and inverted over the first two rows to the last three. If you remove the last three columns, you can tell that the first three columns are actually just the numbers 1 to 6 in binary.

According to the commentary, it was originally intended to be the lottery numbers from some point in 2000. But it was supposed to be mirrored when Fry read it on his butt, so this couldn't be done.

It's interesting to note that it has yet to be truly explained where the time code comes from or how it ended up on Fry's butt in the first place. (i.e. it was put on the frozen Fry's butt by Bender useing a flap of skin from Lars but it only existed on Lars's butt because he is a paradox time copy of Fry.) This may be answered in one of the two remaining movies.