How many of you have had this happening to you?

Here I was, sitting on my computer, drinking beer and listening to music (and playing poker of course). Suddenly one of my favorite songs started.. (I mostly listen to death metal)
I started to mosh and imitate the drummer, banging on the table and floor, thinking I was alone.. when the song ended my friend tapped me on the shoulder and asked: "WTF are you doing?"

I forgot that my friend and his girlfriend were in the livingroom watching TV. They suddenly started to hear loud banging noise coming from my room and decided to check out the source of it.

I can't tell you how embarrassed I was..