The Tripper (2006)

The Tripper is a 2006 American comedy horror slasher film directed by David Arquette

Plot
The film is a nostalgic homage to the exploitation films of Wes Craven and Tobe Hooper that follows a group of free-loving hippies who escape to a modern-day Woodstock for a weekend of debauchery, only to be stalked by a radical-minded psychopath dressed and talking like Ronald Reagan.