Pennies at 85 mph can scare the bejeezus out of anyone.

True story...back in the early 90s, went out to a club, and decided to watch Dawn's Early Light Fireworks at Santa Monica for July 4th. Five cars were headed to Santa Monica from Eagle Rock. Anyways we convoy down, 4 cars are on the #2 lane, buddy is in the #1 lane. Car pulls up behind him and flashes him to pass, honks horn, etc. Its about 3am, there's nobody else on the 10 fwy so I don't know why he didn't just go around. I back off, let him in the convoy and guy passing him flips the bird. Buddy pulls out behind him and guns it, his 68 Cougar (complete with BOSS 302 motor) easily rides the guys Firebird. I pull right and pass everyone with my 68 Olds Cutlass, my motor and exhaust easily waking up everyone asleep in the other cars. The other cars follow us as we chase this guy down. Everyone starts pelting the Firebird with pennies. He breaks for the 405 S offramp and makes it, barely. It was a crazy adrenaline dump.

Haven't done that ever or since.