My husband was hitching a ride for about 100 yards on the back of a pick-up, just standing on the bumper. (stupid in retrospect, but it was only a few feet.) The guy had just waxed his car and the plastic bed liner was slippery on the tail gate. My husband yelled, “Don’t go so fast!” The guy only heard the “go fast” part, and floored it. Hubby went flying. Shattered his tibia and broke his collar bone. Had a crappy local surgeon and spent the next several years in pain and also gained about 80 lbs because he couldn’t be as active as he once was. 11 years ago he got a knee replacement and although it will never be the same, his quality of life improved immensely. He now works out 3–4 days a week and does yoga. He has lost the weight he gained. Unfortunately, he has been having a lot more pain in the knee lately. We can’t really blame the friend. He never should have been on the bumper in the first place.