So here we have the Skippy Burger from Hamburger Patti's in Sacramento, CA:
Yes, that brown creamy substance is peanut butter. On a slab of beef. With fried potatoes. Due to my compulsiveness to try interesting things, I simply had to try this burger and it actually wasn't half bad. Mid-way through I started to feel the effects of a peanut butter gooped piece of beef, at which I point I added ketchup and mustard to balance things out.
Overall this was surprisingly not bad, but I wouldn't have it again.