I love the overheard in Waitrose ones.Or my two absolute favourites:
" Dalhing go find the Manchego for Daddy, we need it for tomorrow's brunch." Heard in a tiny North East Tesco express. Kid must have been 4 if it was a day.
And " Right, that's it Freddy , if you can't decide what variety of organic houmous you want, then you're having none!"
Again child roughly three and maybe a bit and still in a pushchair! Kind of puts the Dumdrums picnic plates in the shade!!.