Where Was This When I Needed It?

I lived in a large student house with five other people when I was at university. I bought pretty nice food and it always seemed to disappear. Sometimes, it was replaced by cheaper / lesser quality stuff and some kind of cutesy note, typically a smiley face and the word sorry - with no name. Other times it just "disappeared".

After several attempts to figure out who was eating his food, one of my housemates put post-its on his food with a message stating he had licked everything. He was crazy enough to do it so noone every called his bluff. My food continued to go missing.

If only I had one of these:

source

I would have been sorted. I'm buying one for the next family member who moves off campus.