A memebomb is a statement that (subtly) disrupts the reader’s belief systems. (For examples, see the Semi-Official Memebomb Archive at http://principiadiscordia.com/memebombs/)
The rules:
Your memebomb should be no more than one sentence long.
Your memebomb should work on you. (The reason is, it’s very easy to construct a statement that you believe will work on someone who disagrees with you, but which won’t work on anybody because you fundamentally misunderstand the person you’re targeting. If it works on you, then you know it at least works on somebody.)