Don't try to short Tesla! Shorting depends on the short-term trajectory of the stock after you borrow it, and Tesla's being bought like mad by people who've put their faith in St. Elon, so this is a great way to lose your money.

The likely long-term outcome is for Tesla to be bought out for a pittance (maybe $20-$30 a share? $10 would be surprisingly low, $50 surprisingly high), by a mature automaker interested in the marque; in the meantime, the way to make money off Tesla is to realize that all the people who are zealously pumping their money into Tesla are leaving everything else under-valued.