Tales from the Crypt (1989)

Season 5: Episode 9

A con artist and his girlfriend plan their next caper by tricking some southern boys into thinking there is oil underneath a cemetery. Their plans work. She makes them think she has gotten jealous and killed her boyfriend, but when she goes to dig him up, she gets a big surprise. He and the boys have been partners all along. The last laugh is on her when it turns out that there really is oil and she blows them all to kingdom come.