"I've been mad for fucking years, absolutely years. I've been over the edge for yonks. Working with bands so long I'm cranking.
"I've always been mad, I know I've been mad, like the Most of us... Very hard to explain why you're mad, even
If you're not mad... "
Lyrics taken from http://www.lyricsmode.com/lyrics/p/pink_floyd/speak_to_me.html