Apparently, Duffy gave his putter away to a little boy on the 10th hole this past weekend in Akron at the WGC Bridgestone. Here's a link to the Grantland article:
This is an exchange between Shane Ryan of Grantland and Dufner:
“Jason,” I said, “I heard a story that you gave your putter away to a kid yesterday. I wanted to make sure it was true.”
“Was that on no. 12?”
Dude is a class act. 100% class.