Sorry, I did not mean difficult as in "doing this would be taxing my physical capabilities"; I meant difficult as in "I just peed all over the climber beneath me in terror".
Try sitting at the top of the world's tallest building. <object width="640" height="385"><param name="movie" value="http://www.youtube.com/v/dtyP9XTmLhs?fs=1&hl=en_US"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/dtyP9XTmLhs?fs=1&hl=en_US" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="385"></embed></object>