My just-3yo is cared for by me at home and sees other children most days. If it's children he doesn't know particularly well (e.g. at the park) he'll want to play with them and will play nicely. At classes/weekly activities again generally they'll all run around together and it's fine. However if he sees one of his friends that he's known a year or so, he can play nicely for a bit but will get overexcited, particularly if we're in a house as opposed to a park or other large space. As an example, at home he'll run around shouting, upend toy boxes and empty all the contents on the floor, and throw toys (in an excited rather than aggressive way, but still...)
A few of his friends are the quiet type who don't run around at all, making his behaviour seem all the more unusual, and sometimes too much for them. When I say "his friends", they're the children of mums I get along with, but my son asks when we're next seeing them etc, he does like them.
Also he's due to start nursery school after the summer and I wonder how he'll cope in a room of 40 children.
Anyone else? It seems obvious that I need to either stop him becoming overexcited, or calm him down quickly, but how?