Over-Exertion

I'm really tired. Happy, but tired.
I thought I was doing pretty well this morning, but while I was walking to work I became distracted with tucking in my shirt and walked face-first into a parked truck.
I was fortunate enough not no have any confused onlookers, yet somehow the event was still emotionally crippling. I found myself abruptly pushed backwards by this non-animated metallic beast with four wheels. My shoulder hurt and I started asking, Why? In what kind of sick world do people park their trucks in parking lots where tired people like me can run into them? I just don't know. I just don't.