[MichaelApproved]

Reduced gravity aircraft. AKA the Vomit Comet.

https://en.wikipedia.org/wiki/Reduced-gravity_aircraft

[jryb]

You only get ~30 seconds of zero G. How would that work?

[YeGoblynQueenne]

Hold it in for three days. Then you're ready to go in a flash.

[dlcarrier]

That would probably make it take longer. A safer bet would be three really strong cups of coffee and two bran muffins.

[spike021]

or get someone who's lactose intolerant and make them drink a carton of milk.