Worst pain I ever experienced was a speedskating crash in 2006 at Kenai, Alaska in the Arctic Winter Games. During the early stages of the 1500 meter race, an Alaskan skater tried a dangerous inside pass on me and lost control, taking both of us out. When we hit the boards at top speed, one of my competitor's skates got kicked through my knee. It shattered the lateral condyle of my right femur, and the tip of his blade broke off inside the flesh. I extricated myself from the crash, not realizing the damage at first, and tried to get up, and my leg collapsed. There was a huge trail of blood behind me, and then I fell down on the ice with the other guy looking at me, terrified. The pain hit around then- I later told the paramedics that it was about an 8/10, on a scale of no pain to having burning needles impaling my body. They eventually got me immobilized and off the ice, and apparently it took them a while to scrape the frozen blood off the ice before they could resume races.
My knee, when the doctors took a look at it, closely resembled lasagna. A few hundred stitches, one titanium screw and a large pump draining the wound later, and everything was back together, although it would take me about two months for me to even be able to bend my knee, and four months to get the ability to walk back.
The feeling of the pump's tube getting pulled out of my leg was also exceedingly uncomfortable, but honestly the feeling was so alien that I don't even think I could describe it as pain. Maybe that can go under 'weirdest sensation'.
