The best though, was the collab with Wintergatan,
where ToT made a component for the Marble Machine. You need to have seen
The Shawshank Redemption to get all the jokes. The ending is very cinematic.
It has cameos from Adam (ScaryMan), Stephan Gotteswinter and one or two others. They mainly popped in to comment (negatively) on whatever ToT was saying or doing. I think Tony said something like "just use the 3-jaw, ain't nobody got time for indicating-in a 4-jaw". Cut to Adam who is of course indicating-in a 4-jaw, who just glowers and grunts. I think Stephan just rolled his eyes, shook his head and sighed.
Plus Meatball the kitten has a hilarious part, watch to the end!