I doubt that "Myth Busters" has even bothered with it since it's such a 'No-Brainer, but there 'are' YouTube demonstrations that warn not to try it at home proving that it technically Does,,
However,, if your gonna use it against a violent assailant like in the frkn Movies you'd be very-well advised to take him by complete surprise & have a fool-proof plan for what to do next, Ha! and QUICKLY!
Because even though a shot of flaming-hairspray to the face would certainly singe some eyebrows & nose-hairs and potentially ruin somebody's day if inhaled,,,
Realistically, it would take allot less than a "One-thousand, Two-thousand, Three-thousand' count for most Bad-Guys to get Pissed Off about it enough to shove the can down your throat & stomp you till it sprays ouch-yer-Azz!!