This was on my home page a LOT of time ago, found it again today among old stuff
Q: But what *IS* the internet?
A: It’s the largest equivalence class in the reflexive transitive symmetric closure of the relationship “can be reached by an IP packet from”.
[From Craig Simon on the IETF mailing list which I followed around 2000 A.D., where he stated that he did read it on “someone sig line”.]
They were funny times.
[and then again, this post was originally written on Jan 22nd, 2009 :D]