Today's good, clean, uncomplicated fun is right here in the form of this video - it does what it says on the tin.
See also the melodica version of the "welcome to Jurassic Park" scene. (via laura olin's newsletter)
Update: I knew there was some similar M83 thing that I'd seen recently and was forgetting about: Midnight City but with Nelson Muntz laughing. (via @dansays)