A childhood belief about special powers

When I was about four or five, I thought you could fly (oh, what an unusual belief) if you held an umbrella above your head and jumped off of something, like Mary Poppins. So one day I climbed up to the highest part of the playground, opened my umbrella, and...*thud.* Ouch. Thank god I did it when nobody was around - although the reason I waited until I was alone was because if I managed it I didn't want anyone else to discover the "secret."