A while back I was setting at an uncontrolled bike path crossing, setting there waiting on my trike, waiting for traffic to clear. Along came this huge diesel pickup with young guys in it. Just as they passed me, the driver floor boarded it and it belched out a huge cloud of black smoke. It was so thick you couldnt see anything for several seconds. The cloud of black smoke was so huge even the drivers following couldnt see anything either. Nice guy, makes me wish I had a large rock in my hand.