[supercat]

Boy, were they surprised when they got the signal from their leaders, ran to get the stuff out of the bushes, and found - nothing!

Too bad the police didn't swap the molotov cocktails for "bottles" made from cellulose nitrate. That would have really given the jerks a surprise...

[supercat]

...or for anyone who thinks that unbearably cruel, how about replacing the gasoline with a non-flammable liquid? Then anyone throwing the thus-altered molotov cocktail could be charged with attempted arson and/or attempted murder.