A game played at primary school, and a shocking parody of the life that was to await some of us in 4 or 5 years time. We'd take off our jackets and stuff them up our jumpers, pretending that the resulting bump meant we were heavily pregnant. The McGregors then walked around, hand on hip, complaining "Ooooh, my back's killing me" or "My ankles have swollen up". More mundane phrases would include "When's your's due, then? I've got two weeks yet."
The game came to a thrilling climax when the best McGregor, Naomi Smith, would proudly announce that her piles were playing up. We didn't know what piles were. I bet she does now, though. Ha.