Ryan Dunn, costar of MTV's Jackass movies with longtime friend Bam Margera, died this early this morning in a car crash, according to Bam's mother April Margera. His Porsche apparently soared over a guardrail in West Goshen, Pennsylvania, before hitting a tree and blowing up, the local police department reported. Another unidentified person in the vehicle was also reported dead. Dunn, 34, was known for his daredevil antics and absurd jokes in all three Jackass movies. TMZ reports that Dunn tweeted a photo of him and his friends drinking several hours before the crash.