Quotes: Harder Than Hard

"You will not survive."
— Description of Veteran difficulty in Call of Duty series, as well Modern Warfare

"This mode is difficult!"
— Announcer in DDRMAX through Dance Dance Revolution SuperNOVA 2, on selecting the Harder Than Hard Challenge mode

MetaSeraphim: I finally beat impossible mode, after 6 days of non-stop trying.
DANGER - Are you prepared to battle sheer despair? (NO) (BRING IT)
Ultra Mode warning screen, Mushihime Sama (English-language iOS ver.)

DANGER - This style is customized for advanced players. Proceed only if you have prepared yourself.
Strong Style warning screen, DonPachi Resurrection Black Label

Deity — Muahahaha! Good luck, sucker!

Good luck.
The loading screen for "Through the Fire and Flames" on Expert difficulty, Guitar Hero III: Legends of Rock