I think saying you have balls of steel is much better than actually having balls of steel. Especially if you travel. Everytime you go the airport, it's the same old story with the TSA.
"Yes, I've taken off my belt and removed all of my jewelry and change from my pockets."
"Are you hiding anything on your person, sir?"
(whispers) "I have balls of steel."
"Excuse me?"
(shouts) "I have balls of steel!"
"Sir, could you please step out of line and follow us, please?"
"Really, you should already have me on a list. Shouldn't there be a list for this sort of thing? There really should be a list. I travel all the time..."