So we were watching a documentary on the Holocaust in English the other day (don't ask) and for the entire hour, I had the ankle of my left foot balanced on my knee.
Eventually, the documentary ended, and I tried to wiggle my toes. I then realized that I couldn't feel any movement, pain, or vibration up to the middle of my calf. It was a horribly strange experience to try and move my feet, not feel a thing, and see my toes writhing under the tip of my shoe.
Anyway, I stood up and suddenly fell over because walking on a numb leg is like walking on a rubber peg leg. You have no coordinated control of it, and you're unable to make your foot roll like it normally would when walking.
The worst part, however, is when the little rubber stub below my knee started to regain feeling. That pins and needles feeling was here, only 100x worse than anything you could ever imagine. Simply moving my foot made me yell something that sounded like a combination of a shudder, scream, and laugh.
Walking was the hardest part. I was about to piss myself just walking across the school to my locker.
TL;DR: My leg lost its feeling and felt like hell afterwards.