I would go on the interstate and all the bad drivers I saw I would blow them up haha lol jk I would go on a rampage what would you do!!!!!!!!!!!!!!!!!!!!
I would definitely go around scaring people by pointing the barrel at them. I don't think I would have the heart to actually blow up some building though.
I would first make it able to shoot painballs and set up a small buissines leting people drive it themselves for money. After i get enuff money i would quit the buissenes and buy another and have a great big paintball war.