Tweet2 days ago it was at night I was watching TV and I got up off my chair and all of a sudden my knee was friggin in so much pain I couldn't walk on it. Taking a shit trying to sit down was like pulling teeth my knee hurt so bad.Now I did legs like a week ago had no problems,havent twisted my knee, didn't fall, didn't do shit to it but all of a sudden I cant hardly walk on it now without limping, I'm like WTF. Its in the back of my left knee. cant straighten it out.Now if doing legs and a week later then something happened is weird but I didn't do anything to it. This just came on its own