In a comment to an earlier post, ninjanuns  mentioned skunk spray. I mentioned that the aroma of skunk is not too bad, at a distance. I got to thinking. This is invariably dangerous. Let's play chemistry major, shall we?

The major volatile in skunk spray is (E)-2-buten-1-thiol:

CH₃-CH=CH-CH₂SH (Pretend that the CH₃ is slightly below the CH=CH and the CH₂SH is slightly above. It's significant. Really.)

A very similar compound is allyl mercaptan:

CH₂=CH-CH₂SH

This lovely substance is the major volatile in, of all things...

GARLIC!

No wonder I don't mind skunk!