Any ROMANCE manga where the girl or guy tries out for something (can be sports, dancing, singing.. anything) and ppl underestimate him/her, thinking that he/she will suck but is in fact, surprisingly very good.
[ex.]: Full Moon Wo Sagashite, Skip Beat

Don't know if it really counts, but try maybe Power.
It's a gender bender though, but the girl tries out for basketball and everyone thinks "he" is gonna suck cause she is so short.
Only one I can remember right now.

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"This year, they should give the Nobel Peace Prize to the inventors of cancer and accidents, because research shows those are the main causes of disarmament."

Uwasa no Midori-kun!! if you don't mind smut.

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If you've ever thought or said "Nice Guys finish last" and really meant it, then you should probably read this LJ post by DivaLion. It's incredibly insightful whether you're male or female.

From a bumper sticker I like:
"If you're gonna ride my ass, at least pull my hair."

Ice Revolution

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Feed your head.

Try some of these: (all Shoujo)

Crimson Hero
Gokinjo Monogatari
Limited Lovers
Penguin Revolution
Sonna Koe Dashicha Iya!
Tsuki no Shippo
Purikyu

Try Lovely. Im not really sure though, cuz it really hasn't gotten far.

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Have a heart and click!

Hikaru no Go kinda

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What I like in Trivial Pursuit style. Pick your category: