So i was thinking maybe you could put a banner above or below video's that says somthing like, "finished the anime, why not visit the forums" Or somthing like that (i'm not good at slogans) :P
Its might help to get to get more people into the forum, and help reduce the number of people who just watch anime and leave xD

And in case my idea is stupid, i'll distract you with a lolcat !
Spoiler :  

Isnt it cute oh yes it is ^^