There's loads of parents who put their DC, who wont fit into the seat at the front and who could be walking, into the shopping trolly where the food goes, with their shoes on.
I've seen how much dog shit is on the paths and roads, and I know most food is packaged in cellophane these days, but still...I put that food on my kitchen top when I get it home
I'm sure it's much easier putting the little monkey darlings in the trolly to stop them running riot around in the shop, but it is pretty nasty.