Captcha Alternative

I've been thinking about this for some time so here i go.

All current captcha systems have been defeated (except maby recaptcha).
But here is my idea for a new system:

Computers cannot handle emotions. At least, not yet.
So why not generate (or select from a libary) a picture or text that represends an emotion. Like love, hate, joy, etc.
This would be easy for humans to use, but bots will have a very hard time.

Of course this kind of captcha will need to be updated regulary, or a complex algoritm should be designed to genate them. But in theory it should be a possible strong capcha. 

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