I was involved in a somewhat similar surprise last summer. My friend Brian Doyle Murray graciously offered to host a foursome at Prairie Dunes as an auction item at an Evans Scholars fundraiser. I was also bringing a foursome. A week before the date, the winning bidder told me one of his guys dropped out and asked if he should dig somebody up or if I could get their "fourth". I opted for the latter. They were wondering who the "fourth" was and where he was when we got on the small plane to fly to Kansas, but I only told them that he would meet us in Kansas.
You should have seen their faces when Bill Murray was waiting for us at the little airport in Hutchinson, Kansas. "I told you I'd get you a fourth," was all I said. That was pretty priceless stuff. And it raised a lot of money for a great golf cause as well.