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MacGyver defuses a highly advanced nuclear warhead using a paper clip to short circuit the timing device.
MacGyver places a stick through the trigger of an AK-47 and hangs it from a tree with a piece of string. He then attaches a paper match packet to the string and lights the matches, using them as a time delay. The AK-47 falls to the ground with the stick still attached to the trigger, causing the AK to fire and distract some guards.
He also makes a "Rocket Thruster" by hitting the end of a flare gun with a rock to make the nozzle thinner, launching him and a man he rescues from a mountain. Not only would the thrust produced from a gun of that size be unable to lift the weight of two human beings, flare guns fire projectiles. The more realistic result would be a jam at the end of the gun, much like if you bent the barrel of a normal gun.
When near a deadly laser grid, MacGyver lights a pack of cigarettes to make the lasers visible. He then smashes a pair of binoculars, removing a prism to deflect a laser beam back to the emitter, destroying it.
To help rescue a group of people trapped in a building, he ties a fire hose shut, places it under a girder in the way, and turns on the water. Using the water pressure to lift the girder, he pushes it out of the way.
MacGyver plugs a sulfuric acid leak with chocolate. He states that chocolate contains lactose and sucrose (chemically C12H22O11), which are disaccharides. The acid reacts with the sugars to form elemental carbon and a thick gummy residue. (This has been tested and confirmed by Mythbusters).
MacGyver creates a bomb to open a door using a gelatin cold capsule containing sodium metal, which he then places in a glass container filled with water. When the gelatin dissolves in the water, the sodium reacts violently with the water and causes an explosion which blows a hole in the wall. ("MythBusters" questioned the size of the explosion but verified that pure sodium does cause an exothermic reaction when mixed with water. However, the amount of sodium required to destroy a concrete wall would greatly exceed the size of a cold pill.)
MacGyver uses the main lighting power switch to transmit morse code to the surface.