Someone mentioned this on Slashdot so I found the "source."
<Geno> Dude...
<Geno> I was wearing my All Your Base shirt...and someone pointed out the craziest thing
<Geno> "Somebody Set Up Us the Bomb", when read Backwards, is "Bomb the US (united states) Up Set (upset) Somebody"
For those who don't know, here's the "official" All Your Base... site. But if you don't already know, it probably won't help.