This is Jack Lew's signature:
Seriously. That is really, honestly his signature. It has been confirmed. And if he's treasury secretary, that signature might begin appearing on legal currency. The Daily Intelligencer mocked up what that would look like:
Obviously, that would turn American currency into the best money ever. Unfortunately there's always the chance that Lew could ruin everything by making his signature less, well, loopy. That's what the fun destroyer Timothy Geithner did when he became treasury secretary.