Patio11's comment that this was roughly 10 years ago almost fits when this rather amazing gentleman passed away.
Look, we all know HNers are smart enough to Google up the particulars. That would put me in the awkward position of having published a private conversation by a deceased gentleman who generously paid for several dozen poor students to go to college, including me. I'd appreciate if you just wrote this one off to "I trust Patrick not to have invented this story out of whole cloth" and let it lie.
It's not like you told us he secretly punched babies to steal their toys. It was a charming anecdote. It makes him look like a great person with a sense of humor. If anything, the story is entirely flattering. This is not the stuff secrets are made of.