Also, don't worry about it until you re-rack/bottle/whatever. Any damage it would have done by being in there is already done. Pop a new one on there in the meantime.
I used a long flat head screw driver. Completely forgot I had the carboy sitting there with a stuck stopper in it, until i finally cleaned up the porch! It was like scoring a free carboy!
Thanks.. I will try the plastic bag trick. Thankfully I has another stopper so ill just wait until the apfelwine is done. 1st time using a Carboy too... Haha