TMZ has seen the working script for "SM 5" (don't worry we won't give too much away) and it starts with LiLo and Charlie in bed making a sex tape (obviously, what else?). As they get started Lindsay tells Charlie, "Okay but let's do this quick, I got a court hearing in the morning ... It's a driving mishap thing."
CHARLIE: "Promise me you won't drive."
LINDSAY: "That's very sweet. You're worried about me behind the wheel."
CHARLIE: "I'm worried about me. I'm a pedestrian."
But wait there's more ...
As things start to get hot and heavy (don't worry they cut down the actual kissing!) Charlie keeps running into LiLo's numerous bodily devices ... i.e. her sobriety monitor, tracking anklet, and a dog shock collar for orgasm help.
Once the scary stuff kicks in -- and Charlie gets thrown across the room -- Lindsay SCREEEAMS ... but it's only because she's watching her own crappy movie, "Herbie: Fully Loaded." In the trailer (below) the joke got switched to her watching the news instead ... which shows her probation being revoked.
The jokes go on like this for awhile until at one point Lindsay literally runs over Charlie with her car, tosses the keys to someone else and says, "You were driving."
AND FYI -- This is all from the "working script" (Hollywood speak!) ... so you can check out the trailer, but it's anyone's guess what made the final cut.