The $50,000 turn signal

Turn signals are a key instrument of driving. They allow the driver to notify nearby drivers of the need to either switch lanes or turn onto another road.
Wait, why am I explaining what turn signals are for, that's one of the first things you learn in drivers ed...
Have you ever been driving and all of a sudden a guy in a (insert luxury car here) pulls up next to and slightly in front of you; and you know he wants in, but no signal? Why does this guy think he can break all the rules and courtesies of driving?  Do we owe him something? 

I'll tell you how I treat this guy, and it's up to you whether or not you want to do the same...  I do everything in my power to prevent this guy from merging.  If you can't take 1/2 of a second out of your busy day to hit the little lever next to your heated, leather-wrapped steering wheel to notify me of your merging intentions; you don't deserve to merge in front of me.