The most recent one .. when I got into an accident and my right foot caught in the impact. I saw the bone protruding and bleeding but didn't feel much pain .. too shocked I guess .. it was the aftermath (treatment and shit) that was most painful.
No, I kind of knew I broke it when I fell. I had to have surgery. And even today, I have a plate with about 11 screws in my ankle. I couldn't do surgery right away because it was swollen, and operating on it would infect it. Thats why they shifted it back in place and wrapped it up until the swelling goes down. God it was painful.
Had a barbell with 2X 10kg weights call on my forehead... that was only temporary, less then a minute later I went back to working out. Maybe the cramp I had recently on my calves is the most painful in memory, great way to wake up.