Easy this one hasn't been topped by my own eyes yet.
Rewind back to 1993. My buddy was attending Central Michigan University. I drove up early on a Friday to start the weekend early. I'm on US-27 about 10 minutes North of Lansing. I'm doing 70 and exceeding the Limit by 10mph. Out of nowhere I am passed by a rusted out Plymouth Satellite. ABout 10 seconds later a mid-80's Suburban also passes me.
I'm thinking "WTF?! I'm already doing 10 over and these guys are both passing like I am standing still?" No sooner than the thought leaves my mind. I get passed by 3 Michigan State Police cars, 3 Ingham County cars and 2 different Local PD cars. Now I'm thinking "WTF?!"
As soon as I laugh and say the former, the Suburban careens into the Satellite, sending it into the culvert divider, onto the oncoming lanes. The Satellite goes into the culvert, and broadsides the Suburban, which goes into the grass. These *******es did this 3 complete times. I'm laughing so hard, I can barely see through the tears.
The MSP cars hit their rear quarters spinning them out. I pull onto the shoulder behind one of the Deputy's. One of them comes up to me. He smiles "You know you were doing 10 over back there?" I'm still laughing hard and go for my wallet. "Why'd you pull over?" I told him "Sir, I'm only 21 years of age and I just witnessed the funniest thing I'll ever see in my life." He said "Yeah, you should have heard the radio traffic, it was a hoot!" I told him if they needed a witness or anything, I'd stick around. He just asked where I was going, I told him I had a buddy at Central. He said "If yer gonna drink, be smart and don't drive."
13 years later, I have yet to see anything top this with my own eyes.