Best line any guy can say

Uhhhhhhh, I'm pretty sure it's "Will you marry me?"

I'm a female and I think women should also be thinking this way when they argue with their significant other :)

Or.. Johnlock is Cannon!

Yeah because if I lose that part of my spilt personality, it will be a long schizophrenic life for me.

...because jerking off is harder when you're alone

Or you could stop dating dogmatic assholes and find someone reasonable.
*Ducks in cover to shield myself from dislikes*

Just shoot her

That's quitter talk.

I'm sure it's the best line a girl could say to her S/O too :)

I say if she holds your relationship hostage over a disagreement, dump her before it's too late.

This implies it's more important for her to win the argument than be correct. So, it's better to feel happy about the answer than to have the right one. And no feminists have weighed in to point out the sexism? How this implies that women are stupid, fragile, and short-sighted? (Even if true.)
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-No dear, topping off the transmission with engine oil is wrong
-Don't make me feel bad about this decision...
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-I don't think you should let your friend invest all you money in leveraged commodity futures just because she is trying to start an investing business
-You don't understand about Friendship!

It's really sad that someone would dump another person because they wouldn't agree with them about something