It annoys me when kids - both when I worked in retail and when I am visiting shops - touch, muck about and play with stuff that they (or their parent(s)) going to buy.
I have seen kids opening the blind boxes and bags - think Lego figures, Pokémon.
Play with footballs
Then have seen evidence of multi packs opened with a bag of crisps taken. Sometimes it’s the parent that opened the multi pack and pay for the item as their DC was screaming and giving a bag of Quavers just to keep them quiet.
Look but don’t touch