The more I think about it, the more I can’t believe “This Is the End” actually exists. This is a movie where the world ends, and we get to see how Seth Rogen, James Franco and Jonah Hill — all playing warped versions of themselves — would survive.

It’s as if Columbia Pictures gave first-time co-directors Rogen and Evan Goldberg millions and said, “Go crazy!”

The premise is really just an excuse for Rogen, left, and Co. — Danny McBride, Craig Robinson and Jay Baruchel, right — to destroy Los Angeles and make raunchy jokes.

The film, out today, has a spiritual forebear in Neil Patrick Harris’ career-reviving cameo in “Harold & Kumar Go to White Castle.” But instead of playing against type, “This Is the End” plays with type. Rogen smokes a lot of weed and acts like a child. Franco is a sexually ambiguous, art-obsessed nerd. McBride parties hard and is generally an awful human being.

“This Is the End” easily could have been a Funny or Die video. Thankfully, it wasn’t. It’s silly, it’s stupid, and I couldn’t stop laughing at it.

They turned an inside joke into a feature-length film, and we’re all in on it.