I just bought a new Nokia 6200 mobile phone. It actually works pretty well, and has net access. While thumbing thru the user manual (hey, RTFM), I came across this gem of an explanation under "Technology Background":
A technology called Hypertext Markup Language (xHTML) is to mobile devices what the World Wide Web (WWW) is to personal computers.
I'm trying to think of other things in this vein.
A submarine sandwich is to a fish what a sausage is to a human.
A truck is to a deer what gasoline is to venison.
Eh, it's not quite the same thing. Others?