“Shriekshow” (*1/2 out of four) was a low-rent horror show about four friends (Rebecca Rinehart, Diana Noris, and others) who travel to a horror circus and soon meet a ringmaster who tells them four terrifying tales of horror and terror. Unfortunately, none of them is worth listening to. Opening credits have a clever homage to “Halloween IV” but it’s all downhill afterwards. ’80’s horror sirens Tuesday Knight and Felissa Rose have key roles but they themselves may want to “shriek” at this point at what their careers have devolved into.