I like quotes and funny rules. A good quote makes our presentation more interesting, draws attention to the presenter and makes the presentation unforgettable. Ridiculous or easy-to-remember rules help us keep in mind essential things.
Below one of my favorites:
"A language that doesn't affect the way you think about programming is not worth knowing."
"A team shouldn't be larger than what two pizzas can feed."
Now it's your turn to share your quotes and rules related to IT ;)