Mouse-culator
Sometimes, you can make something better fusing two products into one. For instance, there are hybrid bots that vacuum and mop, cars that drive and fly, and mouses that mouse and calculate. This invention never really took off as Canon thought it would, but it’s still an interesting concept.
Although this image looks like it came from the mid-1990s, this mouse-culator is actually a fairly recent device. It also came with Bluetooth connectivity, so you don’t have to worry about pesky cables. However, you can open Excel or Calculator on your computer, there would never really was a need for this 2-in-1 atrocity.