It's more than possible no one else will find it funny, but there's a running joke in my family the only thing a microwave is good for it melting butter.
You see, my grandmother was always one to get the latest gadget, especially if it was something for the kitchen. So, when microwaves first became common, she got one immediately. The thing is, she wouldn't use it for anything other than melting butter, but for some reason the melting butter thing was a big deal to her. I don't know why. It isn't as though melting butter is any labor intensive undertaking, and yet, while she refused to use it for anything else, she'd wax poetic about how it melted butter.