Is there *nothing* so offensive and juvenile that it's off-limits, even to me? Maybe not.
odor
In these sensitive times, stereotypes are a big no-no. Hopefully, this doesn't apply to chemicals, because there is one group of them called esters. They smell really nice, even though the two components that combine to form esters can smell like foot odor or vomit. A stinky chemistry lesson. Hold your nose and read.
Wine lovers have probably experienced this. When opening a bottle there can be a smell similar to one of a damp basement or wet dog. But there's nothing wrong with the wine. Instead, there's a trace chemical that leaked out of the cork, which confuses your olfactory receptors into thinking that the vino is fino. Yet it is not ruined. And now, here's a chemistry lesson from hell.