Nuh-uh. It broke off at the base, partly underground, during a wind. The inside of the base doesn't look normal. It's black and crumbly. It's probably some disease/pest. Any arborists here? In any event, I'm confident I haven't violated any Oak Tree Ordinances, city, county or state.
I didn't do it. You didn't see me and you can't prove anything. neener neener.