I was thinking about hoplites (Been playing lots of EB lately). It seems to me that hoplites could be defeated easily with one of the most crude weapons ever invented, Molotiv Cocktails. Basically bottles of alcohol with a rag on fire extending out the end.

Think about it: A bunch of armoured men in a dense formation, if they get out of the formation they will get cut to pieces (Assuming the opposite force is non-hoplite) but what can they do if the person next to them suddenly goes up in flames?

Would this be practical? Is there examples of this on record?