Always take gymnastics before you go to show off in front of a villain. It never works. If you can fool your friends, you can fool your enemies. Young children are always more trouble than they're worth avoid them at all costs. Fruitcakes make life interesting albeit chaotic.
Anime girls grow fangs when they're mad.
If you fall in love with a girl make sure she IS a girl first. If you're trying to defeat a Dark Lord, throwing a spell named after them is really dumb. Never EVER try to sleep when a redhead is talking to you. The ones who look the friendliest are the most likely to single-handedly wipe out most of a species. Girls are deadly.