Teachable Moment: Occam's razor has many applications but recently I used it as a coach for a First Lego League team. The children were making increasingly complex Lego contraptions and in order to reign them in, I introduced the concept of Occam's razor which didn't dismiss their complex efforts but challenged them to think of simpler solutions. After a while, all I had to do was simply say "is this consistent with Occam's razor" and they'd go back and find a better solution.
From Wikipedia: Occam's razor (or Ockham's razor), often expressed in Latin as the lex parsimoniae, translating to law of parsimony, law of economy or law of succinctness, is a principle which generally recommends selecting the competing hypothesis that makes the fewest new assumptions, when the hypotheses are equal in other respects. For instance, they must both sufficiently explain available data in the first place.