This has bothered me for ages! (re: Travel faster than the speed of light)

Hmm.. I think we'd see a "photonic boom" - a bright flash, the light equivalent to a sonic boom. You know how light travels slower through glass for instance? And even slower through other materials? I vaguely remember an article somewhere about light being passed through glass (or something) at the same time as a very high speed neutron was shot through it (which doesn't slow down much at all), and it produced little flashes of light.That's just my guess anyway. I'm not a physicist.