After a little while, this chap says "what sort of cereal do you prefer?"
My son, at first a little taken aback replies "well, I normally eat muesli, but sometimes for a change I try a packet of corn flakes or bran".
This chap slowly turns round to face my son with a look of total bemusement on his face, and it's only then that he notices the blue tooth phone strapped to the guys left ear.