Eldest child: "Thank you for my new Disney clock, Mummy. I love it"
Youngest child (at the top of her voice): "I want a new cock, Mummy. I want a big cock!"
Mummy and daddy: peels of laughter
Youngest child (realising she's said something funny, just not knowing what): "BBBBiiiiiigggggg Coooooccckkk!!!!!!!!"
Eldest child starts mimicking to get in on the act.
Inappropriate shouting continues for a good 2 minutes.
It's a good job we weren't in the middle of the supermarket.