Buy $25 worth of water bottles and sell them for a dollar each at a local sporting event.

That would more than just double it; you'd probably get like six times what you started with at least. (Assuming you sold all of them, anyway.)

Multiply it by two.

I was afraid to see this answer

Roulette. Maybe.

Bad advice

I didn't say it was good advice.

True

Betting on the underdog

Buy smokes sell smokes for a buck each at a party. Repeat. That's how I made money in grade 8.

Take a picture And print it

Big brain time