A childhood belief about chewing gum

Up until I was about 8 or 9, for some reason I didn't like to spit out my gum, I had this thing for swallowing it. One day while I was sitting at the doctor's office with my mom, I started to figure out what happens with the gum when I swallowed it. Then I had this mental picture of my throat...there was a floor-like board that would cut off my throat from the rest of my body and it almost looked like a dark, poorly-lit room. I thought that whenever I swallowed my gum, it would land on that floor, and just accumulate. I pictured multi-colored, chewed bubblegum just piling up, and I stopped swallowing my gum after that because I thought that if I didn't stop, it would just build up until I couldn't swallow anything anymore, and then eventually, I would have chewed bubblegum coming out of my mouth. I guess I figured that because food at some point dissolves in your mouth, food passes but since gum could potentially be chewed forever, it would never dissolve and would just sit there until there was no more room. Needless to say, it was a very productive doctor's visit.