Simple, straightforward, sock-em stress-relieving silliness, from the long-gone KewlBox.
This one feels pretty timeless - doesn't matter who you are, doesn't matter where you are, doesn't matter when you are, most (if not all) of us will have to deal with taxes at some point.
Music's pretty nice, and beating up both the accountant and his tax buddies is pretty cathartic. Seems the score caps out at 50,000 points, which I reached pretty easily via an autoclicker.