What video has the college professor who teaches a class, then asks if anyone still believes in God?

There aren't any videos that I know of (I tried looking for you). Everything is just a video of text telling this story. There is another version of this story in which the chalk did break, so I wonder if it didn't begin as either a true story or as a viral internet "inspirational message of the day" and become "fact" to either support someone's religious belief or (in the case of the latter) support their message. (I'd also like to note for the asker's sake that they didn't ask whether or not you agreed with God's existence or not.  more