Carry-on, carry-on

Over lunch at work today, I perused a copy of the USA Today that was sitting out. On the front page of its "Life" section was a big article about new regulations for airline travelers (turns out it was last Friday's paper). The thrust of the article was the new ban of liquids in carry-on luggage. It contained this lovely photo, showing a receptacle full of confiscated liquids--mentioned in the caption are beverages, deodorant, shampoo, sunscreen, and toothpaste:


Take a closer look at the photo, though, and tell me if you see what I see:

Yeah. That's mayonnaise. Not a small container, either. Someone had mayonnaise in their carry-on.

This raises so many questions that I have no idea where to begin.