{{JZ}}
I remember once, a few years ago, another grad student in my department was giving a seminar talk, and there were some people visiting the department that she really wanted to make a good impression on. She had to bring her three-year-old in with her that day, but her friend had agreed to watch the kid while she was giving her talk, and this was a friend that the kid knew and had spent plenty of time with and was totally comfortable with. Until that day. She went to give her talk, and her daughter would not let her go. She finally left, and her daughter was just screaming, "I want my mommy! I want my mommy!" This was loud enough that the mother could hear it while she was trying to give her talk. Finally, after about ten minutes of this, the last "I want my mommy!" became "I want my water!" and she was given a sippy cup of water, cuddled with her mom's friend and whimpered for a few minutes, and fell asleep.