I used to think that when someone was "under arrest" it meant that when they went to jail they would get the bottom bunk so they would have to sleep "under a rest"-ing prisoner.
A childhood belief about criminals

others believed things like this
- I used to think if you got a parking ticket, you spent the rest of your life in jail!— Dixie Chicks Fan
- I used to think being engaged meant being in jail. I have no idea how I came to that conclusion.— CNB
- I thought the women in Prisoner Cell Block H were actresses banged up in prison themselves.— Reb Kean
- I used to believed that when I went to sleep my heart took a rest too, and didn't pump at all while I slept.— Lara
- I used to believe that if you jumped off the top of a bunk bed, you'd magically gain superpowers.Anon
- I used to believe that if you did not keep your shoes tied, that the police would arrest you.— Kelly