Angry JAM who yells stuff at me, only to get caught at a red light a quarter mile up the road where I get the chance to roll up next to him and question his sanity.

Actually, my favourite driver (doesn't fit the cager/JAM profile) is a guy from our loading docks. He drives a big ol' 80s Suburban, and one day when it was snowing he slowed down and offered me a ride up the last hill on my route to work. I declined, he shrugged, and now every morning when he passes me, he gives a polite toot on the horn and says 'good morning' as he heads up the hill.