The jet turbine engine concept cars of the '50s. Yes they were slow, and due to the jet you had to wait 5 or 6 seconds for the engine to respond if you wre stopped... but the exhaust temperature was around 3000º from huge nozzle in the back. If there was even one on the road- can you imagine cruisin down the highway, you pull in front of a Toyota, and it melts? Or you back in to park and light a few people on fire? Those cars also had pretty cool cockpits; they were one seaters and it took two or three minutes to remove the bubble top so you could get out. Too bad they were slow, I think top speed was only around 120.