The same type of person who gives their 4 year old a recorder in Tesco.
TOOT TOOT TOOOOO
TOOOT TOOT TOOOOOOO
TOOT TOOT TOOOOOOOOOO
The same squawking note for 20 mins while the mum did a full trolley shop without batting an eyelid.
I had just got my child to fall asleep in the buggy and had to leave in fear he would wake up.