Most people know about the strange smell that asparagus gives off after it has been, ahem, processed by some humans. Yet other humans aren’t able to smell the odor at all. That makes asparagus an unusual marker for the intricacies of genetic variation.
Source: The Asparagus-Urine Smell Is Surprisingly Controversial
The gas that gets pumped into your house has no smell. This means the first sign you get that you’re inhaling gas is a lack of oxygen to the brain. To correct that problem, companies use a chemical characteristic of badly made wine.
Source: This Chemical Saves You From Gas Leaks And Bad Wine
I learnt of mercaptan when dealing with propane. I never knew it was used in wine production, but I guess it’s not the sort of thing you’d want to show people on a tour 😉
In the theme of misheard lyrics:
Insane in the methane: