Spoiler Alert (but not really)

Rating: Null/10 (12 May 2001)

OK, I haven't slogged through all 280 comments, so forgive me if this has been covered. I'm really getting annoyed with the people who perceive the "plothole" about Lenny remembering his condition.
Lenny presumably figured out what was wrong with him because he remembered handling Sammy's case. In other words, he had studied this condition in depth before his accident. He recognized his symptoms and remembered what he had learned about Sammy. (If Lenny had never heard of this condition, then he probably wouldn't be able to explain it.) He has a tattoo on his hand that reads "Remember Sammy". This is an easy way of triggering his memory. At MANY points in the film, he looks at the tattoo right after "waking up". Sammy WAS a real guy, even if Lenny got his story mixed up (don't want to get too far into spoiler territory here.)
There are so many greater mysteries in this movie (notably the last 10 seconds or so) that I'm amazed people get bogged down in this fairly straightforward plot device. I have seen the movie twice with different people. There is always much argument afterward, but none of my friends have questioned this particular point. If you don't like it, fine. But at least make an attempt to understand it before condemning it.