My Embarrassing PC Moment

We all have those moments where we suddenly get a brain fart, and then realize too late what's going on, so here's mine:

I have a Dell Latitude D530, and runs Win 8.1. I had been playing a console game for an hour or so, and wanted to bring up my browser to check something out. But when I clicked it, nothing appeared. So after about 30 mins, I realized something, I had forgotten that I had extended my screen to my tv. I couldn't believe it, I felt so embarrassed that I just started laughing at myself for not realizing it sooner. Mother thought I had lost it when she heard me, and asked if I was alright. It was just one of those days I will never let down.