[mudil]

I love potassium permanganate. Growing up in Soviet Union, we used to add potassium permanganate to bath, supposedly to clean your skin. But I love it for its oxidizing properties. Mix potassium permanganate with magnesium shavings, and you have a pretty powerful explosive mixture. Put a drop or two of glycerine into potassium permanganate and glycerine spontaneously burns. There are tons of interesting experiments you could do with potassium permanganate... So many wonderful memories...

[zzazzdsa]

When mixed with sulfuric acid, it forms manganese heptoxide, which does lovely things like ignite paper on contact and detonate if heated above 50 C!

[algesten]

Or mix with aluminium powder (from arts/crafts-store) and get fun flash explosive mixture.

[xtreme]

Or make chlorine by mixing it with hydrochloric (muriatic) acid. Or mix it with glycerine to get a fire from "water" (it used to be a common trick performed by godmen). Pottasium permanganate is wonderful.