>>4189488It's retarded, but it's a policy you see supermarkets do in middle-class areas because they don't want their houses to be egged and floured during Halloween.
Here is an American shop doing the EXACT same thing.
http://www.huffingtonpost.co.uk/entry/grocery-store-egg-sales-minors_us_562fbf72e4b0c66bae59bd8d