When I was in high school, I befriended a girl with untreated manic depression. During her highs, she was charming and energetic, always ready with an adventure to pursue, but her lows, which came totally without warning, left her despondent, paranoid and inconsolable. I had no idea how to deal with someone who was gregarious and vivacious one minute, morose and teary-eyed the next.
Watching Lucky Number Slevin brought back memories of those roller coaster times. The movie careens between spunky banter and utter ghoulishness with enough volatility to give me whiplash. It features some great scenes, snappy dialogue and appealing performances, but the erratic tone keeps the pieces from fitting together well.