mercaptans (including ethyl mercaptan) are used as odorants for natural gas and propane. Ethyl mercaptan is also one of the constituents of skunk scent.
The CIA & KGB while trying to figure out a way of leaving notes in dead animals found out that other animals would eat them & the note. They both found one thing that was so horrible that no animal would even come near....Tabasco!
Just thought of another animal smell that is truly repulsive: ever had a garter snake excrete that white substance on your hands as you were holding it? It's a defense mechanism much like a skunk's, but I personally consider the snake's to be an even more potent chemical - you just can't wash it off!
That was from a History channel on the cold war and they really didn't get into that side of it. I thought it was interesting that the 2 sides came up with it independantly.....rats and wolves were the hardest to get rid of but Tabasco did the trick. For a while the US agents would put notes attached to rocks and put them in rocky fields. The KGB started using infared because the rocks in the warm cars would show up easily on their infared detectors and so they would intercept the notes. You could tell a CIA agents car back then because they all started using coolers (even in the dead of Moscow winters) to 'fix' that problem The old cat and mouse game
I also noticed some votes for cat urine. When I was a teenager my friend threw a beanbag chair on my head that his stupid cat had peed in. You think it SMELLS bad...
Wow. Some amazingly smelly stuff here. It makes one almost curious to smell it. Sort of like, "Oh come on. How bad can it REALLY smell?"
My humble entry is something that may not be up there with some of the previous entries, but it is a smell I have recently found that I cannot stand.
Mop water.
I HATE that smell. I work in a hospital and cleaning crews are always moving their cleaning carts around. If I see one coming, I head the other way. That skanky, dusty, hideous retched smell. Gah!
Well it's understandable why mop water in hospitals would smell real band, with a lot of the stuff that has to be mopped up there. Mop water can smell pretty bad when a kitchen or bathroom has been mopped up, so add all the things from a hospital and that smell must be multiplied.
Perhaps hospitals should have better hygenic standards than a bathroom or kitchen. But they don't. I recall reading a letter in the New Scientist claiming that factories producing processed food products generally have higher standards of cleanliness. The text is reproduced below.
i can't beleive that no one here has mentioned rotten raw chicken or old bananna peels.
these smells are definitely those that are unique unto themselves and a lil' goes a long way.
if i am cooking, anything that is biological goes outside right away. i have never understood how some people could simply throw biological waste into the house garbage and smell that crap for a couple of days or until they take the garbage out. Talk about trifling......