Jake's Cafe, Ritzville, Washington
On a long road trip when I was a kid, we stopped at this little place. I don't remember the food, but oh the milkshakes.
They were served in the mixing cup, with a glass to pour the shake into. The shakes just didn't pour well, though; they were THAT thick. It might be nostalgia speaking, but they were divine.
The cafe still exists, but there's no website, and few reviews anywhere. Check it out and tell me if it's still as good!