If math wasn't already annoying enough, this unique piano shaped calculator plays a tune with each key pressed. In the right hands, crunching numbers could become a tiny concerto. But in your hands, it will undoubtedly result in a swift and brutal retaliation by your fellow co-workers. Let's just hope Phillip Glass doesn't get wind of this. Available for 1000 Yen or around $9 [Product Page via TFTS]