Probably old news to you folks, but interesting for newbies like me: "When Treasury Secretary Salmon P. Chase designed the original $1 bill in 1862, he put his own picture on it." (from "Mental Floss" Amazing Fact Generator)
Interesting. I looked it up. Aka the Chase Dollar (I want to share this image with you from the internet.. not mine)
Here is another interesting fact about Mr. Chase (I want to share this picture with you from the internet.. not mine)
My only example. Bought it from a lady at work that said the local coin shop only offered her $100 for it.