I thought that, instead of us traveling, the world would simply turn and we would be moved across it. But our mind would trick us into thinking we were walking.
I felt so clever thinking of that as a kid.
Like this. I thought that you would move incrementally faster if you drove in the opposite direction the earth was turning.
I also thought that if you jumped through your TV screen you could be in the TV show. Which led to lots of philosophical and painful thoughts about re-runs.
=/
I also thought that nipples were gross.