sorry to hear that bro. I had my share of bad luck yesterday too!!!
After being without trainning for 2 weeks, because i injured myself on dead-lifts and f*cked my ciatic (sp?) nerve (i still feel my back, i will have to find a chiropratic doctor...), i got back on the gym yesterday to train chest...
The workout was good, i even break some personal records on 2 exercises, and on the end i decided to train calfs...
Doing calfs on the leg-press machine, on the last set i forgot that i didnt locked the machine, so when my leg was going down to finish the exercise, the lock was off and i almost got crushed on the machine, LOL
Well, the machine has a safety lock, but i think that because of the extreme angle that my knees where put, now my left knee is hurting ,
(so i cant train legs today, as i was planning)
One more injury for the collection...just one of those days that you make stupid things and pay the price for it...