The invention that I would like to be created is... (Singapore)

a device that allows us to apparate (just like in Harry Potter).

With a device like that, we will be able to transport ourselves to our destinations within seconds, especially during peak hours when public transports are usually packed to the brim. I really hate having to squeeze with the crowd. Also, apparating saves time and we can use the time that is normally used for travelling to do other stuffs.