mama say mama saw the mountain side

The story:

I got up in the morning and I was singing this song at the top of
my lungs in the shower. When I wrapped the towel around me and
opened the door. My sister was waiting for me with a horrified look
on her face and dragged me to the computer to listen to the song. I
sang along and then she looked up the lyrics for me. I turned red.
She laughed out loud at me. Then she let me get dressed.