Discription of Events: FVX-8780 Black Ford pickup truck. Erratic driving. Inconsistent speeds; ie. would speed well above the limit most of the time, then slow down below the posted speed limit; I flashed my lights to signal 'WTF'; when able I drove around him apparently he didn't like that. So he rode on my bumper for about half a mile until I slowed down. He was too close to me so he had to swerve onto the shoulder of the road. We parked at Lowes traded words. He threatened to do a lot of shit so I didn't care so I got out so he could. In response he got back into his car and I call the police as he drove away. Cowards should never have oversized vehicles, it inflates their already delusional egos. mid 40s, white Caucasian man, about 190 lbs