Joe DiMaggio used to be the official spokesperson in the Mr. Coffee commercials, and not knowing who he really was- I thought his name actually was "Mr. Coffee"!
A childhood belief about adverts

others believed things like this
- I thought you could get toffee from mixing tea and coffee.Anon
- until 12 yo i thought buying and drinking coffee was illegal when you were under 18:) — smarty
- I always refused to eat coffeecake because I thought it was made with coffee grounds. Anon
- I always thought there was a drinking age for coffee, because it was an adult drink like beer and wine.Anon
- I used to believe that coffee was tea with milk in it.Anon
- I used to think it was illegal for children to drink coffee— C.W.