Important memo or note at a pediatric ward of a hospital? Well, you are still communicating with adults, so you don't need to use a "childish" font. Funeral? Nope. Childs Birthday? Nope.
Moral? SO there are people like me, who don't give a leap what font you use. Its fine to communicate with us with Comic Sans or Dingbats or whatever. Ignore the people with their banners crusading for better communications through clever framing of the ink.