Violate a rule, but do it blatantly

Any of the four linguistic rules for dialogue can be broken if done in a lucid way.

For example:

• To show customers just how affordable its furniture is, Saudi Arabia IKEA replaced monetary values printed on price tags with images of coffee cups, pizzas, bananas, and other relatively inexpensive everyday items.
• The Japanese ice cream brand Akagi recently apologised following a 12-cent price hike on some of its products after 25 years without change.