Pigeon

Brother 2: Did you know that when you drive your car faster than 120 mph, it sprouts wings?

Brother 1: Yeah, I've had that happen before.

Brother 2: But not big wings, little pigeon wings.

Brother 1: Yeah, and it slows the car down to about 8 mph, slowly flapping, about 1/4 inch off the ground.

Brother 2: Exactly.