I was in a restaurant and a mother with a baby aged about 10-12 months and in a high chair were at a table near us. The baby was playing happily with a plastic toy when the mother suddenly dropped her spoon on the floor. He thought it was funny and gave a happy squeal. So the mum kept pretending to drop the spoon to make him laugh. The problem was that each time the laugh got more and more high pitched and in the end he was literally screaming with excitement every time she went to 'drop' the spoon.
This went on for ages and people were turning around and giving her annoyed looks and two women at the table beside them moved away.
AIBU to think she was being really inconsiderate and that this went beyond just a bit of happy playing and strayed into noisy and disruptive behaviour (from the mum, obviously, not the baby).