J has been O's nanny since he was 2 1/2 months old.
Today they were at the park, as always. A woman that they had seen many times before at the library or in the park asked J if she could watch her baby (hold the baby) while she took her older son to the park bathroom (he's potty training). G was at home, with me.
You have to understand that we live in a really small town (a "village," actually), so everyone knows everyone and this isn't all that weird.
So O sees her with the baby and bursts into tears, yelling something like, "No, J, no, you are mine and G's nanny and nobody else's! You're not that baby's nanny! You just have two of us!"
Everyone who knows O at the park was floored since they never see him act like this, and he kept it up until the woman came back with her son (upon which, she immediately apologized to O for "borrowing" his nanny).
Too cute, and very possessive.