I learned backstoke before I could swim, like normal people do and I couldn't see where I was swimming!!!
Once I was backstroking near the beach and after a while got tired, so I thought it was enough, but I couldn't find the ground and then I saw that the beach was really too far, like 3 pools or something. I got panicked and don't know how managed to stay on water without drowning till my dad came and saved me...The very next day I learned how to swim properly, not only on my back!!!
I don't have any pool stories...sorry...