Don't get my sympathy
Hanging out the 15th floor
Thom Yorke said of this line:
"I went to a party on the 15th floor of a block of flats, passed out at 3am, and woke up an hour later. There was a guy hanging, off his head, out the window saying "I'm gonna do it". Took us half an hour to get him back."
According to the viewpoint of the song, this is narcissistic behaviour. By hanging on the ledge for so long and shouting, you're just trying to draw attention to yourself.