The Grand List Of Console Role Playing Game ClichésFollow

Dimensional Transcendence Principle
Buildings are much, much larger on the inside than on the outside, and that doesn't even count the secret maze of tunnels behind the clock in the basement.

Magical Inequality Theorem
In the course of your travels you may find useful-sounding spells such as Petrify, Silence, and Instant Death. However, you will end up never using these spells in combat because a) all ordinary enemies can be killed with a few normal attacks, making fancy attacks unneccessary, b) all bosses and other stronger-than-average monsters are immune to those effects so there's no point in using them for long fights where they'd actually come in handy, and c) the spells usually don't work anyway.
Magical Inequality Corollary
When the enemy uses Petrify, Silence, Instant Death, et cetera spells on you, they will be effective 100% of the time.

Supply and Demand Axiom
Killing a powerful enemy will usually yield an item or weapon that would've been extremely useful if you had gotten it before killing that enemy.

The Moral Of The Story (Ghaleon Rule)
Every problem in the universe can be solved by finding the right long-haired prettyboy and beating the crap out of him.