It's always impressive to watch a Karateka breaking bricks with one single hand !

But when you can watch the brick breaking in slow motion, it's much more impressive to see what's happening to the man's hand and arm...

My advice: don't try this at home ! ;-)

More info:

• The Wikipedia Page about Karate
• Karate Trick : Learn How To Break a Brick Easily
• Discussion about breaking bricks experience