How many legitimately funny anime exist?

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The comedy tag is completely useless as we all know. There's tons of crap out there that tries ( usually fails) to be funny once in a while but mainly focuses on fan service or action.

I can count the number of anime that actually really made me laugh on one hand.

>Gintama
>Prison School
>Danshi Koukousei

Is there any series that I'm missing?