“Pet Graveyard” (*1/2 out of four) was a wretched horror thriller about a group of teens (Rita Siddiqui, Andrew Hollingworth, David Cotter, and others) who undergo an experiment which allows them to revisit the dead but naturally things go fatally wrong as their past mistakes and sins come back to haunt them. The kind of low-budget movie that is made and released to cash in on a much larger one (“Pet Sematary” in case anyone didn’t guess) but this actually rips off “Flatliners” and also “Witchboard” in equal measure so no one feels left out of the party. But you can’t bring dead themes and a dead movie back to life.