Before he became renowned the world over for playing Barty Crouch Jr. (and some other role I can't remember off the top of my head), David Tennant starred in what was possibly the world's most stultifying anti-cigarette program. Together with some bemulleted child, a 16-year-old Tennant plays a teenage smoker with "beautiful legs."

It's so painful I had to watch one of John Waters' no-smoking spots immediately after.

Hat tip to Old Wookiee!