A childhood belief about church

I wondered why when the eucharist is raised a bell would be rang, so I asked my mom right after it happened one day in mass. She leaned over and whispered in my ear that it meant I had to keep totally still and stop talking. For a couple years, everytime I heard the bell I would freeze. Then when I went to catacism and the teacher asked what the bells represented, I raised my hand and proudly said, "it means you can't move." the whole class just laughed....I didn't even hear the real answer because I was so confused that wasn't the real reason.