Personally, I'm not too inclined to get my head blown off after chasing some wanna be gangsta down.

In the seige of Stalingrad during WWII they had these little beauties which were a sealed pop bottle with benzene, liquid rubber, and phosphorus. When exposed to the air after breaking the bottle, everything ignites in a big gooey mass.

gregas: just find the car, dump a load of iron oxide and aluminum powder on it, light with a sparkler -- instant thermite.