Don't have a cow, man...

Never seen that before.
A woman comes flying out of her house, jumps off a five foot deck into the field where a cheeky calf is nibbling on a fence post, grabs a piece of wood to use as a javelin, hurls the thing at the wee cow, yelling ‘Noooooooooooooo!’.
The calf ducks the missile and shimmys away from her aggressor towards sibling calf and the relative safety of the other side of the paddock.
Even animal husbandry is extreme in New Zealand.