Well, not as a child, and not bike related, but:
Famous military actions from history. The one which springs to mind occured outside a pub one summer's evening in the beer garden, and requests were taken from other patrons. One of the requests was "Do the Dambusters raid!"
So we did.
About 6 or 8 of us piled up on top of each other, sort of curled up into balls. These people formed the "wall" of the dam.
Then, two of the bigger lads picked up the smallest chap. The bigger lads were the Lancaster bomber. The smaller lad was the bouncing bomb.
The "Lancaster" withdrew to the other end of the beer garden. The "bomb" was curled up, and firmly grasped by the "Lancaster".
The "Lancaster" then "flew" across the garden at full pelt. About 6 or 8 feet away from "the wall", the "bomb" was released and lobbed at the wall.
The resulting carnage gained large cheers of appreciation, and a reasonable amount of free beer. At only the cost of minor bruising.