Pratt, Michael (Routledge, November 1980, ISBN 9780710005649)
While waiting in a queue last year, I saw a baby mug another baby for a foam football.
The mark clung to the football for comfort as it wandered around the floor. The mugger rushed up, pushed it over and scooped the football off the ground before running away in that wobbling stagger that looks like the baby has tumbled over with each step and just caught itself each time.