According to "Inside Edition" (and an L.A. County sheriff's report), while filming in the Malibu canyon one day in 1988, Brad Pitt strolled up to the highway, dropped his shorts, and flashed passing vehicles for an entire minute! After an indecent exposure charge was dropped, Brad was fined $450 and sentenced to two years of probation. The reduced charge? Disturbing the peace!
[According to a report in The Express in 2002, Brad has also been known to moon trains as they pass his Santa Barbara ranch.]