Apparently also acceptable is "My Mom packed it" which is what my kid told the counter agent while I was busy with some paperwork.

But does anyone else remember flying shortly after the Lockerbie bombing? I flew out of Gatwick a month after that, and it was 20 Questions at the check-in desk. These days if I have checked baggage I often give it to the curbside folks and they're more interested in the size of the tip than the contents of your suitcase.