Here in Britain there’s a TV show called Brainiac, and there’s a prank where a low explosive paste is placed on objects and a hidden camera watches an unsuspecting victim touch it. Lulz were had.
Today I’m going to explain how to make it. If you've watched the show then you'll already know one of the ingredients is iodine (which can be bought from a pharmacy). The ‘secret ingredient’ is household ammonia.
To make your paste, crush iodine into a fine powder, and add about 6 times volume of ammonia. Stir for a while, you’ll notice small bubbles of hydrogen gas forming. When the bubbles stop, the reaction is complete. Allow the mixture to settle for 10 minutes, pour off the water and unreacted ammonia solution, your paste is ready.
You can store it for later use by keeping it in an airtight tub with a few drops of water. Storing it for prolonged periods of time will slowly degrade it.
To use, paste it onto a surface and allow to dry. Touching it will cause it to explode.
Have fun! (And don't use too much at once, or it could seriously hurt whoever touches it (Which would probably be you))