Going Thought Blind

Ahem. Well, then. I think we all learned an important lesson about late night drinking and blogging, didn't we? Let's just move on then.

Have you ever gone thought-blind? I've noticed this phenomenon before, but I only put a name to it recently. It happens when you're so lost in thought that you lose track of what you're physically doing. One time while I was really concentrating at work, I got up and went to the bathroom. Suddenly I snapped back to self-awareness and had a moment of panic as I realized I HAD MY PANTS DOWN AT WORK!

Another time, I actually tried to carry on a conversation. I went to buy a drink and the conversation with the girl at the register went something like this:
Register Girl: Hi
Me: Hi, how are you?
RG: I'm fine.
Me [anticipating "and you?"]: Good, thanks.

So I guess the question is, have you ever gone thought-stupid?