Because I love my job. I didn't really know how much I love it until 5 minutes ago when I was browsing the internet and suddenly thought, "I wish Monday would come faster so I can go to work."
I still remember the last job I had four years ago which was cleaning and inspecting parts of high speed trains, and it sucked. Every morning of every day I'd wake up saying, "It's six a.m. already?? But I just went to bed 10 seconds ago!" and dragged my feet to the bathroom which was not an easy task because it always felt like someone put 2-tonne shackles on them.
But now, every morning I go to work singing "Take the shackles off my feet so I can daaaaaanceee.."
My job is awesome.