[pmiller2]

Don't you mean burning Mg? It does react with water at room temperature, but very slowly (unless it's powdered).

[einhverfr]

Now my most spectacular and explosive mishaps involved Mg, vinegar, and fire. Now, there is some fun to be had.

Vinegar + Mg + dish soap makes a foam that can explode under certain circumstances, That;s not dangerous, but it can make an amusing mess.

You can also make torches whose flames are invisible in daylight or cause small explosions of you know what you are doing.

[atakan_gurkan]

My guess is he meant Na.