When I was an undergraduate, I knew some seminary students from the Presbyterian seminary, in Knoxville, Iowa. They were graduates of the U of I ... where I was attending. One of them was from my home county .... and I got to know a few through him. I believe it may have been in either '72 ort '73, one night drinking a few beers ... one of them told that joke. However, it was a missionary, as opposed to a professor.