I use the same container as a coworker. His wife packs his lunch. When I bring in chili or spaghetti he could honestly mistake it for his own. Less likely with most of my lunches though.

And that’s not a hypothetical. He hasn’t confused our lunches but we do use the same style Pyrex containers. Mine is usually in a bag with fruit and such, but occasionally I put it in the fridge by itself.