LOL so funny! I can't remember when mine first did it themselves being as they're now 44 and 41. I do remember the eldest one having a lot of problems with constipation when he was about 3 and constantly soiling himself - his daughter also suffered the same problem and was in hospital a couple of times, she still had problems when she went to school which resulted in some nasty taunts from the other kids and letters home to her parents. The younger granddaughter seemed to be about 4 when she stopped shouting 'ready' when she was done.
Awwww, he is so happy to see me…..