Well I just had one today. I know this is too much information, but here it is. I got some jock itch and probably shouldn't have rode in the first place. After riding into work, I could only do 7 and a half of the usual 18 miles back so 19 instead of 30 mile RT because of the intense pain. Had to get picked up. I would have done even less but I couldn't stand waiting for a pick up so kept on riding at a slow pace until my wife could pick me up. First time anything like that ever happened to me.
Now I am wondering how long this will knock me out.