I have a folder of hundreds of youtube clips that interest me that I created for my best friend when he stops by (unwatched and archived folders). Videos that range from things you'd see on a "faces of death" video to "cute cat videos". In fact if anyone looks in it, I'm a little scared to think what they would think of me.
Anyways I picked out some cheer-up ones from there for this thread, sorry for the spam! I highly recommend the cow one, I didn't know they had so much emotion, I kind of get the whole Hindu sacred cow thing now.