I like the "Secret move that increases strength but damages body", but only when it's done right. If there's any form of cop-out (like a deus ex machina for fixing said damage), it becomes one of the worst cliches.
Quote from Mushu
I call it training. As in BEFORE the fight, the character gets stronger, no need to pull crap out of a brown place like Goku turning super saiyan on freeza.
Goku turning super saiyan on Freeza was
epic when it happened. The problem came in when every battle manga started doing it over and over (including Dragonball).
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"It is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science."