Since we're not currently ascending into heaven, it's a pretty good bet that we all have at least one mean bone in our bodies. If you're nice pretty much all the time, it's probably just a pinky toe — but it's there.
That's because sometimes, being mean is too fun. If you've never sat back with a blissful smile after making the whole room mad with a joke, you haven't lived.
And these people would probably agree with me.