Yes, two years ago. Thought I was not going to last until my wife got there. Not sure I stayed conscious the entire time.
In the middle of the hot summer I had ridden 80 plus miles the previous day. At about 60 miles on the second day I was riding with cyclist that were simply faster than me. I bonked. I overheated. I lost it. Very happy to still be there when my wife arrived.
I have been more careful since then.