At least for me, I have trouble remembering pain. I can tell you something was painful and that I never want it to happen again, but I find it hard to compare the top instances without being able to fully recall them (not that I want to). My top three would be Shingles, my almost third degree burn, and when I slept wrong and tweaked my neck in such a way that if any part of my body made the slightest movement stabbing pain would ensue. The last one left me unable to lie back, sit up, or stand on my own until the medicine started working. It also hurt so much that I thought I was going to vomit, which was terrifying because of the thought of all that movement.