There are so many. Too many. I recently watched the doc, Being Elmo, and they show a scene from Jim Henson's funeral and I cried like a baby and couldnt get the thought out of my head for days regarding what kind of a world it would be, had he lived longer.
Another for me is the song that Ma Otter and Emmet and his jugband sing after working thier first night in the resturant as a tribute to Emmet's late Father. Even as a kid, that scene really got to me.
This ine is newer, but everytime I watch The Muppets, when Kermit starts singing Rainbow Connection and then everyone joins in during the Telethon, I cant healp but shed a few tears. Even listening to the soundtrak, I tear up.