Burn Notice, Season 1

Michael:
[V.O.] Rescuing a hostage isn't about battering rams and guns. Charge through a door with a gun and chances are the person you're trying to save will be the first one lying on the floor dying of acute lead poisoning. So you come up with alternatives: ingredients from the local pharmacy, mixed with aluminum foil, powdered in a coffee grinder will make a serviceable flash grenade that would stun anyone for a good 20 feet. Thermite is another handy tool: with a surface temperature of a thousand degrees, it's used to weld together railroad ties. It would make pretty short works of most locks too.