If you've ever been in Prague in the summer, it's extremely likely that you will have seen a man swallowing swords and banging six-inch nails into his nostrils, near the bottom of Wenceslas Square. His name is Emil Ondracek, and - incredibly - he swallows the swords over half a metre into his body. Mr Ondracek, who usually wears a t-shirt of the heavy metal band Metallica, calls himself a Czech fakir.