In the 70's an advert on UK TV for Wrigleys Spearmint Gum had people carrying around enormous packets of gum. I believed that when you bought and opened a packet of Wrigleys Gum it would inflate to this size.
A childhood belief about adverts

others believed things like this
- When i was young I used to believe if I ate ham fat I was going to inflate like a balloon— a guy
- I used to believe that the people on tv were really in the tv and if you opened the back they would be there!— Kathleen
- i beleived that when someone bought a new house, they would swap with the person they bought it from— c
- I used to think that you could get arrested for having a packet of Rizla's that had bits torn off the top...— Patch
- I used to believe that God looked like an enormous version of "Woody" from the Toy Story series.— Ryan
- When there was an advert for a "3 peice suite" i thought it was a shop selling 3 P Sweet's!!!— Kate Parker