I recently saw this youtube and am now thinking this may be a very young Jim Carrey. I work in the Dental field and looked at the child's teeth shape, thin upper lip and it's lead me to believe this is himself. The eyes and actions he makes are pretty convincing to me as well..I would like some thoughts on this...the dates would be in line as well as this was likely shot in the late 1960's or early 70's...
http://www.youtube.com/watch?v=D5ScEl4ehsE