Well, the old curtain capers! I have found that they (I have/had two climbers at one time)....will learn NOT to do it if you let them know that it is not a good thing to do. I have resorted to a sharp "NO" as they head for the site and then I reach for the ole' spray bottle. One or two shots of the spray will usually do it. I still see them eyeing the curtains from time to time. Mine happened to be fastened securely to the frame of the window, so who knows what they do when I am at work! Good luck and I hope you let them know that some behavior is just not acceptable. You will be happier in the long run. Cats are not stupid, by any means, and don't like being scolded, so there is some light at the end of the tunnel! GOOD LUCK!