PaRaDoCkS
Check out this real life paradox (if you have *nix you can try this trick out yourself):
PoserBookG4:~ ben$ host www.thissitedoesntexist.com
www.thissitedoesntexist.com has address 205.196.213.164
PoserBookG4:~ ben$ host www.thissiteexists.com
Host www.thissiteexists.com not found: 3(NXDOMAIN)
Awesome, I finally discovered something worthwile!