Humor is always subjective from person to person. What one person finds funny isn't true for another, and some individuals aren't as open to "adult" humor as others. Still, when I need a laugh or at least something to make me grin a little bit, there are two sites that usually provide me a quick pick-me-up.
The Onion is a satirical news site that constantly features new content, all of which is farcical and fake, yet usually at least a little funny.
My real go-to for comedy is actually YouTube. Whether I'm in the mood for epic fail videos, stand up, or Three Stooges-style slapstick, it's easy to find a somewhat funny video and then just let the autoplay feature keep going through related content. Some of it is downright dumb and not funny, but the things that are authentic are really good.