"A kid is sitting there eating. Another one comes along and asks..." and then the title is used as the joke. Back in the eighties, me and my cousins would do that exchange any time we were eating anything as long as we weren't at the table. Doing it at the table brought out the hickory switch. Our grandmother was old school like that.
The joke in the meme is a play on chicken cæsar salad. The chicken sees 'er salad, which is the pile of lettuce because that's the simplest form of a salad.