Adulting is tough. You can’t watch Sesame Street without being judged once you turn 21 – but who doesn’t like watching colourful, furry Muppets interacting with humans? You could watch Avenue Q, but musicals are expensive. So it’s fortunate that we’ve got The Happytime Murders coming in to fill that Muppet-shaped void in our hearts. It’s an adult murder mystery set in a world of…