Oh chemistry.. I will never escape you..

So I was eating some left cheesy potatoes that I made a few days ago, and I realized how interesting butter was. I warmed up the potatoes because cold potatoes just aren't that appetizing, and the butter that had occupies the entire bottom of the tupperware container had melted. I ate the potatoes and cheese. When I finished eating, the butter was still melted. I left the container for like 10 minutes, and then I looked at it and the butter had already solidified. I guess my dining room is really cold.