Twin Vehicle Embarrassment

The feeling of embarrassment when you see a vehicle identical to yours next to you on the road. This usually entails a self-conscious attempt to avoid glancing at the other driver - who is no doubt attempting to avoid glancing at you.

"Why are you lookin' at me, man?"
"I'm ignoring that car over there. It's the same make, model and color as mine."
"Oh, you're suffering from Twin Vehicle Embarrassment. Drag."