There are sixty known sword swallowers in the world  - that's 1 in a 100 million people who practice this ancient and very dangerous art! Audiences often suspect a  trick sword (particularly if you are a Magician) but the trick isnt in the sword, the trick is in your head! 
But for those of you who dont believe its the real deal check out what happened to this poor guy -

Photo: Tuoi Tre - The sword swallower is being treated at Cho Ray Hospital