What was the surprisingly the EASIEST frugal change you made this year?

We talk so much in this forum about biggest impact type stuff, or what to do in certain situations, but I often think that our advice is a tall order for someone taking a plunge. Our basic advice (make coffee at home, learn to cook) is pretty well traveled ground.

So what was the easiest change you made this year, why was it easy, and why are you surprised by how easy it was?