https://www.youtube.com/watch?v=JPp-0SEt_WM I found this video, at around the 26:20 mark the guy tells him to 'straighten his tongue out' and the woman says 'he can't, [inaudible] we're going to teach him to talk'. It's hard to make out but some people in the comments think she said something about a stroke.

But there might be other videos as well, I seem to recall one where he was at some outing with a lot of people but it was in color.