Originally posted by Atobe:
You can keep a hockey stick - if you play hockey; or if you are a golf player, a No 9 will be quite handy. 
Between a cricket bat and a baseball stick, the baseball stick is too obviously aggressive compared to a cricket bat, which is not exactly lightweight. 
A couple of baseballs, cricket balls or golf balls will be good - only if you are good with your throws. 
If you are not exactly too inclined into sports, but a keen gardener, you could keep an extendable hoe in your car - but you need to be good at 'shaolin long spear kungfu' before using such an equipment. 
Something for me to think about. I've had my fair share of facing road rage. I don't think I handled it well though.
I look very young and most drivers assume they can bully me into submission. Maybe I should take up cricket or golf.