My right shoulder has been killing me for about 2 weeks now.  It started when my dog, Kaleb, decided it would be fun to chase a squirrel while I was walking him.  He ran off and nearly pulled my arm off.  I didn't think much of it at first - I even played a game in goal the following Sunday.  
This past Friday while at work - the pain suddenly became unbearable.  I suffered through it and even went out for my friend Dan's birthday.  Nothing like beer to fix your pain, right?  Wrong.  By Saturday, I couldn't lift my arm above my head and I finally saw the doctor today.  Prognosis?  It's my rotator cuff.  It's not torn, but it is damaged.  I'm looking at a month's worth of rehab now.
Good times.