I became an Engineer because I have a great fondness for moving things. Lego allows me to quickly throw together ideas and realize thoughts in only a few moments. I easy get transfixed on complicated machines.
Then I found videos from superbird28 on YouTube.com. This person is a mechanical God in my mind. Their creations absolutely mesmerize me. I will link to just one, but I strongly recommend that you check out all of this persons work. It is amazing.