When I was 19 or 20 in China I bought a big bottle of a beverage called Three Snake and Red Spotted Lizard Wine (the kind that has grotesque dead reptiles floating in the bottle) to give as a joke to a family member who collects wine.

The bottle wasn't sealed perfectly, however, and on the flight home it seeped a little. Unzipping my bag after removing it from the overhead bin (this was before the stupid liquids ban) unleashed... an odor.

I got a little worried, not because I was under 21 (I had thought of it strictly as a gag gift and not an alcoholic beverage, so the underage thing hadn't even occurred to me), but because the thought suddenly crossed my mind that the corpses floating in the bottle might belong to endangered species or otherwise somehow be prohibited.

And of COURSE I was sent to secondary at Customs.

After rifling through the outside pockets of my bags, finding my little travel pill bottle with a few pills each of Sudafed, Tylenol, Imodium, etc., and giving me a brief lecture about the Importance of Transporting Pills in their Original Packaging, the agent asked if I had any alcohol.

"Yes, but just one bottle." [thinking about duty free allowances, not drinking ages]
"Are you 21?"
"Oh. [realizing why she was asking] No. But there's no way I'm drinking it. It's a weird Chinese wine I bought for a family member who collects wine." [the truth]
"Where is it?"
"It's in the main pocket of my carryon. But be warned. It leaked a little during the flight and it's pretty stinky."
[Agent starts to unzip bag, catches a whiff, immediately zips it back up and hands it back to me with a smile]
"Welcome home."