Some magic tricks are hard to believe, but Albert Cadabra has one that's hard even for him to swallow -- and he's the guy doing it.

It requires Cadabra, a New York-based magician, to stick a 3-foot-long balloon down his gullet -- whole.

Cadabra demonstrates the mouth-dropping -- and throat-opening feat this Saturday on "Oddities," a show that centers around Evan Michelson and Mike Zohn, owners of Obscura Antiques & Oddities, a New York City store that specializes in one-of-a-kind artifacts such as monkey race cars, possessed ventriloquist dummies and artworks made of human hair.

Frankly, Zohn -- who can usually stomach bizarre feats -- had a hard time avoiding a physical reaction to Cadabra's performance.

"Where on Earth is that going?" Zohn asked. "Uh, this is terrible. Honestly, I was going to vomit."

After swallowing the balloon, Cadabra confided that many audience members ask him when the balloon is going to come back out.

"There is a second part to that act that happens in about two or three days that I only I get to see," he said. "So don't worry about it."