OK, this one is a bit of a cheat. This video of John Lamb‘s Mermaids of Tiburon (1962) is actually only the first two minutes. On the YouTube page there is a link that will enable you online access to the entire movie for one week for a very small fee. I don’t normally do this kind of thing, but there it is. Online videos with Timothy actually in them are getting hard to find! I may have to start repeating myself.
Since Tim is not actually in this clip (even though there he is in the video thumbnail), here is a shot of him from the film, about to brain our hero with an oxygen tank.