Or any train for that matter. I was on jam packed train at the weekend (no spare seats, aisle full of people standing up) and one woman was sat with her small child playing with a toy that said 'triangle', 'square' etc when the kid pressed each shape. I was a couple of seats in front & could hear it! AIBU to think this was utterly selfish of the mum? Other people were giving her the evils but she seemed oblivious.