Ever feel like you smile for a long time, ignoring the pain from your cheeks until someone leaves you alone?

Yep. I definitely know that feeling.
Every time when I smile while being used as a punching bag, I swear my mechanic cheeks would be in so much pain, my eye waters up with oil tears, and the words that can penetrate my metal heart..

But I keep smiling. Because I'm just a robot. Nothing else.