Buy even more groceries and still carry them in one trip

Get half as terrible at juggling.

Two chicks at once, man.

Use the second set of arms to restrain the first set from sexually harassing me

Well I would only assume that I would be a much better rock climber.

Solder without alligator clips

Now I truly never need to make a second trip back to the car for groceries again.

I can finally constantly hold an umbrella

Will the first thing would be to Google how to date 2 women at once.

Learn to play the Antagonistic Undecagonstring from The Hydrogen Sonata by Iain M Banks.

Cosplay Ryōmen Sukuna.

I can quit my job and become a mega cashier at a grocery store. I'd be unstoppable.

oh man I would have to start practicing sleight of hand again I'd be the coolest magician