Jeepers Creepers

In this teen slasher, a brother and sister are driving home together on a college break when they are nearly run off the road by an old pickup truck. A while later along the lonely road, they pass an old church where they see the same truck. The driver appears to be dumping two bodies into a drain pipe. He spots their car going past, and sets off in his truck in hot pursuit. After escaping from this encounter, they decide to go and investigate what happens in that drain pipe...