We all know that Sherlock is a genius who can be quite funny at times, but when it comes down to it, he's still pretty ignorant about things. I can imagine the concept of basic jokes would be one of those things. This meme is a collection of jokes Sherlock ruins with his literal deductions, whilst John watches disapprovingly.
Feel free to submit ideas! After all, how hard can it be to ruin a joke, Sherlock-style? :)