Worst situation situation? It doesn’t go very well and you have to put up new drywall up or use some sort of planking/panelling to address up the mess – In any case, no less than you won’t have popcorn any longer! (read much more in this article re: drywall http://johnnykieyt.blogolize.com/The-Basic-Principles-Of-popcorn-ceiling-removal-contractors-29130660