The house where I grew up was in a town near a military base. At times they had drills where they had planes drop shell, the sound of which sounded like loud steps by the time they reached my neighborhood. Until age 12 at least I was convinced when I heard it that it was dinosaurs coming... I grew up in the 90s and Jurassic Park was big, what can I say... The sound and vibrations were IDENTICAL as in the movie!
A childhood belief about monsters

others believed things like this
- I used to believe the sound of a flushing toilet was nearly identical to the 90210 theme. — Laurenne
- I use to think mountains were dead dinosaurs and grass grew over it.— Tara
- I used to believe that echos were actually the sound going completely around the world and coming back to you.— kyle
- I used to believe that the sound of crickets at night was actually coming from the twinkle of the stars.— Lily Fagioli
- I used to believe that the "shark mouth" nose art painted on military planes was to scare enemy pilots away.Anon
- My sister was convinced that when she grew up she was going to have puppies instead of babies— leohauoli