As a kid, I watched a lot of Tex Avery and Warner Brothers cartoons. And sometimes, in those cartoons, when one of the characters was in a sticky situation, they would pull out a pencil and draw things. Like, if they wanted to escape somewhere, they'd draw a door. I used to believe that you could do this in real life, so in the front hallway of my old house, I drew a picture of a window, thinking that if I ever wanted to run away from home, I could climb through it.
Also in the same cartoons, characters would draw a picture of themselves on a rock or something, and the villian would, thinking it was their victim, go run into the rock. My brother (who's two years younger) used to chase me around the house and try to bit me, so one day I drew a stick figure of myself on the side of a cabinet and tried to lead him to it, thinking he'd see it and believe it was me, and he'd run into the cabinet and leave me alone.
A childhood belief about cartoons

others believed things like this
- I thought cartoons were for kids and "real-life programs" for adults.— Ichigo
- I used to believe cartoons were real people and animals. They were just wet.— Wendy
- I used to believe cartoons where real people. You can imagine how that went... — Emma
- i USED To beleive that cartoons were real and i made them my imageniary friends!— Shaman Queen
- I thought cartoons were real, I remember asking my mom why there were lines around the "actors" in a cartoon.— Steven Graziano
- i used to believe you couldn't draw on erasers with pencils because it would erase itself— Samantha