Re: Hands up
Did that* as a university student, and slipped (was on the 8th floor of ~11 at the time).
Hanging by one hand grabbing a wire mesh wasn't the most pleasant of sensations... But that particular bit of wire mesh did have one very small hole surrounded by a set of somewhat larger ones for at least the rest of that year.
* Technically it was a staircase and it was just easier to scramble up the middle than keep passing cables round the edges. I wasn't aware until afterwards that the blockage between the 5th and 6th floor was basically a single sheet of plasterboard or similar.