Yeah, everyone has those knobby things on the bottom of their review mirror that you can flip to eliminate glare, but some of us are too damn lazy to actually use it. Gentex has stepped in with their auto-dimming rear-view mirror. This mirror will automatically adjust when some jackhole in their massive SUV decides to ride your ass at night, therefore blinding your with their oversized headlights. It is currently an option with the latest Audi TT Coupe.
UPDATE: Oops, we forgot that our mom's car's had these when she drove us to the mall. You guys are so smart!
Fancy rear-view mirrors automatically darken to keep you safe [SCI FI]