On a song called The Hardest Part by Coldplay, the singer, Chris Martin, sings this verse:
Everything I know is wrong.
Now, you have to ask yourself: is the statement itself true or false? If it is true, and Chris believes it, then he does have a true belief, so not everything he knows is wrong. If it is false, then it is not the case that everything he knows is wrong, so not everything he knows is wrong. Either way, he has true beliefs.
Therefore, it’s not the case that everything Chris knows is wrong. 😉