I was on the bus back from an appt. I had to get off the bus early as about 5 mins into the bus journey, a mother with a (guessing) 2 year old kid in pushchair. He was blowing into a recorder making that annoying screeching noise was doing my head in. I was so tempted to approach the mum telling her that her son's screeching on the recorder was annoying, but she looked the type you don't want to mess with.