Maybe I'm the last one to see this but I found the following youtube link showing some awesome deadball era footage and at about 50 seconds in, a man dances a jig on the third base line. As a Hughie Jennings fan, I'm sure this is the he. It's a famous pose but really cool to see it in action....
https://www.youtube.com/watch?v=m-ptxUREjdA