When I was a kid, 7 or 8, my Dad would give me 50p to go down to the local pub and buy him 20 cigarettes and a half-pound bar of chocolate (I was not allowed to

When I was a kid, 7 or 8, my Dad would give me 50p to go down to the local pub and buy him 20 cigarettes and a half-pound bar of chocolate (I was not allowed to enter the pub, but there was a take-away window near the entrance), total cost 48p. When I returned home he always said "and where's my change?"