A Ho Chi Minh City man has an unusual hobby: swallowing iron nails.

Nguyen Thanh Son, 43, also used his special ability to make a living. He has been performing the nail stunt under his stage name Lam Tan.

He himself cannot explain why his stomach can digest iron nails. He started eating iron nails when he was around 15 years old.

Since then, he ate more and more nails. He can eat glass, stones and sand too.

It sounds crazy but he says he is absolutely fine.