No Joke -- Lindsay Laughs During Drunk Driving PSA

5/31/2007 12:46 PM PDT
Two years before going to rehab and her DUI arrest, Lindsay Lohan filmed an anti-drunk driving PSA. Priceless!

Shot in May, 2005, the PSA features the then-blonde 18-year-old laughing -- after pop band A Simple Plan says, "Please don't drink and drive." Hysterical, isn't it?!

Lindsay manages to compose herself long enough to utter the words "Be safe!" and flash her trademark peace sign. If only she had taken her own advice!