The Feeling of Pain

I am willing to bet that you can't perfectly remember what pain actually feels like. For example if you broke your arm/leg at one point, you might be able to remember certain images of that event but not of the pain.

This is because our brains are kinda bad at remembering somatosenses. These senses cover not only pain but also the sensations of pressure, tickles, warmth/coldness, vibrations, and also limb movement. This is actually really beneficial as it would be a pain in the ass if your memories could hurt you or maybe even tickle you.

Although there are times when pain can be connected with a certain prior experience. For example if you are sting by a bee, you'll remember that pain when you see another bee as it'll serve as a warning to you to be careful. This is also the reason behind why all men cringe at the sight of a fellow man being hit in the balls.

The severity of the linked pain is also heavily dependent on the end of the event. If the pain slowly goes away you'll remember it as less painful than if it stopped shortly after the peak.

What we really remember is how pain should feel like but not how it actually is. No matter how many times you slap yourself, you will never be able to memorize that feeling.