I've seen them.
On the NJTP years ago, a tailgater was obnoxiously flashing his brights and waving for me emphatically to pull into the right lane. I was going a little over the speed limit already, so I flipped the guy off and chuckled. When he slowly passed me a few minutes later, the passenger was halfway out of the car red-faced, screaming obscenities, and double birding me. I laughed even harder. Then I saw the emblem on the trailer he was pulling...something about a mixed martial arts club or championship. By then I was in hysterics and it was driving these guys even crazier.
Then I checked my gas: 3/4 tank. Whew.