A running gag in One Piece is that Usopp's lies eventually turn out to be true (with some minor modifications such as his age). For instance, he discovered giant goldfish, pirates came (though they don't find out), and the existence of an island of dwarves. I fully expect every significant lie he says from the beginning of the story to come true in some (likely absurd) way at some point in the story.
I want to know the lies which are yet to come true. Currently, I am only aware that he lied about a medicine that can cure any disease. His claims to be captain could potentially count, but he has been acknowledged by the title "Captain Usopp".
What other lies are left that have not yet come true?