Dumb and Dumberer takes us back to 1986, to when “mentally challenged” best friends Harry and Lloyd were teenagers and charts the boys’ attempts to get out of the “special needs” department and into regular high school life. Hmm, sounds hilarious. This time, though, there’s no Jim Carrey, no Jeff Daniels, and virtually zero laughs, aside from the occasional poo joke and racist or homophobic slur. Despite its awfulness, Dumb and Dumberer managed to double its budget by earning almost $40m worldwide, which means technically it was a hit. Nice one, Hollywood. We guess the joke’s on us.