Well, in fact, Randall's pretty good about the details (vis 2000 people showing up in a park in Cambridge just because he put an undesignated time and lat/lon in a strip)...
Randall: " I drew it based on an older error message where the IP was 10.0.0.243. I changed it to 242 (a) because I try not to get too specific with those things, and didn't want people poking the actual machine at .243 (if it was still there) -- I actually considered putting .276 and seeing how many poeple noticed, but figured they'd just think I made a dumb mistake. and (b) as part of this ancient inside joke involving the number 242 ... "
Funny though, it caused way more confusion with .242, as we have random stuff pointing at it ;-) .243 was enwiki database box until July 2008;-)
Domas