I just came back from the movie theater. I had my knee bent backwards slightly for about 10 minutes right before the movie ended. I tried to extend it out so I could leave the theater, but as I did I felt a sharp pain, as my knee was about to pop. Note: this is the first time anything of the sort has happened, and whenever my knee would pop every year or so there was no pain. About 20 seconds after I tried, all at once I extended it and instantly felt like I was going to pass out. I was sick at my stomach and my vision was blurry. Everything was going black, but when I asked my friend to get a drink for me (after lots of confusion and trying to talk to him) he gave it to me and it helped. ALOT. Why did a drink help me?