Can someone explain this? **SPOILERS**

Rating: Null/10 (11 November 2004)

OK, first off...I thought the movie was pretty good. I'm not looking for a masterpiece every time I watch a movie...I just want it to keep me entertained. And this movie did that. If you didn't like it, great, that's why they have vanilla and chocolate, but I don't need to hear about it in this thread.
The main thing I don't understand is how did Larry get the Dr's pen light? I thought he might have snagged it when the Dr was trying to explain what the patient had to the younger doctors and gets interrupted, but that's when he gets interrogated by the police and they already have the pen light at that point. I guess Larry was the Dr's patient for a while and we should assume he grabbed the pen light at some earlier time right?
Do you think Cary Elwes (Dr) was overacting the entire time to make the audience think he might be the killer or that he might have something to do with it? Or was it just bad acting?
And what did you guys make of the end? There's now way the Dr had enough time to crawl out so do you think Larry go to him and killed him and left Adam to die in the room?