1. Comic Relief
2. SoulPancake!
3. Vice
4. CinemaSins
5. ScreenJunkies
6. Sneaky Zebra
7. AmazingPhil
8. HISHE
9. Howcast
10. SourceFedNERD
So the clear themes are:
1. Keep it 1 minute or under
2. Only use the best content you have on your channel
3. Give the viewers an idea of what they can expect on your channel
4. Have a clear call to action to subscribe
5. Tell people why they subscribe, engage your potential audience