I got a flat tire on my mountain bike and it is impossible to pop the tire off the rim. I resorted to cutting the tire and inner-tube off and tire bead is still glued onto the rim. I certainly didn't intentionally glue the tire on, it is just a regular tire and I'm not running tubeless.
Barring a vindictive ex-girlfriend, the only thing I can think of that might have caused this glueing phenomena is that I couldn't get the bead to sit right so I followed a hint I read here about using windex to lubricate the bead and let it pop the bead into place. It took a bit of windex, but eventually the tire seated itself quite nicely.
I left part of the rim sitting in soapy water today but it still won't budge. Any ideas?