oh man, that one is SO FUNNY! Remember at the end, Kramer had to take the paint off the highway, so he used paint thinner, and something got stuck underneath Newman's postal truck, and it catches on fire! It's something like this--hilarious. And whatever Newman hit, it was metal, and significant to the whole episode. Seinfeld was a genius!

Was the blood involved in this one or another one? Where Kramer starts storing blood in Jerry's freezer and they're driving somewhere and the car overheats so he uses the blood.