Did I ever tell all y'all about fart rocks?
Back in my hot-rodding days a friend and i ran across a curious object...
It was a sulphur block, which was as porous as a sponge, but incredibly brittle, used I guess, for cleaning industrial grills and griddles.
Now, properly protected by plastic and a respirator, we found we could cut that block - about the size of a brick - into a size comparable to a sugar cube, each 'brick' yielding dozens of the little cubes, and the bricks readily obtained as a discardable from any restaurant with a grill.
The thing is, see, these little cubes were very brittle, and could easily be crushed between the fingers... And when crushed, emanated the foulest smell you have ever even thought of in your whole life. I mean this is world class fart-stink.
So being thus armed, the fun was to go down to main street, and climb in with somebody cruisin main... have a beer or two with em... and then somewhere along the way, surreptitiously drop a cube on the carpet and grind it to dust with your heel.
Oh, what fun.... Slammed on brakes, and everybody in the car exiting, right between lights even... Gagging and barfing... It was awesome.
We gave it up though... Folks had to tear their carpet out to get rid of the smell, and no matter how well you cleaned it up, any rain, when moisture hit the floorboard, it came back... not full on mind you, but you still couldn't stand to be in the car till it dried back out.
Truly one of our best pranks ever.