...Because when all eyes in the room are on you because you're giving your presentation, your little daughter (sitting next to you), might choose that time to unzip your purse and pull out a maxi pad and unwrap it and WAVE IT OVER HER HEAD, and just in case anyone missed it, your friend sitting next to you will laugh loudly enough to make sure they all saw it. And you would be embarrassed. If that happened to you. Which I'm not saying it did to me. Ahem.