In our town the slang name for police vans was 'meat wagons'. For an embarrassingly long time I believed that they actually carted off criminals in a butcher's van along with the legs of lamb and stuff.
A childhood belief about criminals

others believed things like this
- My Dad had me believe - for YEARS - that Lamb meat was man made.— Anthony
- When the police are talking about "rap sheets," I thought that the criminals were making rap music.Anon
- I used to think a female daddy-long-legs was called a "mummy-long-legs".Anon
- When you are very poor you "can't make end's meat." End's meat is some sort of cheap very low quality meat.— Betty
- When I was six my sister told me Meat Pies were made from mashed up rats...to this day I can't eat a Meat Pie.— Jamie
- my brother used to believe that Ground Chuck meat was actually groundhog meat. Anon