Okay... I just cussed at my GTP and get to play with the left rear window regulator.
Went to leave work, as always I rolled the windows down, all 4 and the back left one went down a little ways, creaked, made a funny cracking sound and just dropped. hit the button to try and get it back up (false hope i guess) and motor turned but nothing happened, windows fine and can be pulled up but falls back down.
fml.