Schmidt Sting Pain Index 
What's scarier is that it is an initiation rite for some cultures to wear a sleeve made of bullet ants for 10 minutes without showing any signs of pain. See here.
http://en.wikipedia.org/wiki/Schmidt_Sting_Pain_Index

What's scarier is that it is an initiation rite for some cultures to wear a sleeve made of bullet ants for 10 minutes without showing any signs of pain. See here.
http://en.wikipedia.org/wiki/Schmidt_Sting_Pain_Index