think i suffered the first one i've ever had yesterday. i went out with the club despite a slight cough. after a steady 50k at 27kph we got to the café (flat but with a nasty rise at the end) and while queueing i felt the urge to sit down. i managed to order a flapjack, tea and some coke and water for the bidon, but once i sat down i could barely eat, and some of my clubmates said i looked awful. i should say that this speed/distance was no way a stretch for me; indeed we did the same distance to the same café two weeks ago at higher speed with no ill effects. so, i called mrs alec who, despite being eight months pregnant, got the kids in the car and came to get me (at least the café was very kid friendly and does great ice cream). in the half hour she took to get there (the rest of the club went on their way once they knew help was coming), i started to feel better and finished off my flapjack and drank the contents of my bidon. once help came, i had the energy to take the bike to bits to put in the car/roofbox while they sat in the sun eating ice cream. is that the bonk? our saturday clubrun leader reckons so; he phone me later to make sure i was ok. if not, i might need to go to the doctor's.