Over its nearly half-century existence, Saturday Night Live has had the misfortune of banning a small collection of guests. In some cases, comedians took things too far, looking to push the envelope so much they ended up shedding the damn thing to pieces. In other cases, bands used their musical performances to make controversial statements, much to the chagrin of the show’s producers. Then there are the guests who treated the SNL cast and writers like dirt, a surefire way to guarantee you won’t be invited back.