Better methods
The acupuncture needle is a great addition. That Dan adds, but there is a method that has virtually NO PAIN, only the prick when it comes out of the palm. Study the Metatarsals, Tendons, and Muscles to find out.
FYI, the objects that Dan refers to as bones in the hands, are actually the tendons. You can perform this trick 50 times in a single day and no damage, unless the needle is larger than 18 gauge.