I recommend Just for Laughs Gags and Americas Funniest Home Videos. If you're in a bad mood, or just down, you will at some point end up laughing when watching these. :)
[–] batofwonder ago
If you enjoy modern parodies check out Bart Baker. If you like to learn about random things, tedx / tedtalks. If you want to hear original raps check out ERB (Epic Rap Battles of History).
[–] 300 0 points 1 point 1 point (+1|-0) ago
Ashens if you're into his kind of humor.
I personally love LetsPlay's (Achievement Hunter) videos. I'd recommend watching through their mini-golf videos, the GTA V playlist, and if you like them, I'd especially recommend their Sunday Driving videos. So funny. It just depends on what you're into, really.