Sandy Ravage he mostly does game play (call of duty primarily) although he doesn't upload as often these days.
ImprovEverywhere Does massive flash mobs that are just amazing.
LAGxPeanutePwner Guy that uploads a ton of game play that he and his friends do online, they do all kinds of funny stuff like this one.
ERB Does Epic Rap Battles of History, which can be quite funny.
I have a bunch more in my subscriptions, mainly game based ones, but don't actually watch them much.