Word farts

So do you ever have someone say something to you and you are so taken back you speak before thinking and you say something that doesn't really fit. It doesn't have to be extreme, like saying something odd and personal, it just doesn't quite fit. Like tonight for example. I had to go to this visiting artist lecture and my ceramics teacher offered extra credit if you went. So she had to see you there. As I was walking down the stairs to leave, she said "See ya, Amy. Thanks for coming." I didn't know she was there and I didn't expect to be spoken to. So the only thing that stumbled out of my mouth was a quiet "thanks..." That really doesn't fit as a good response and I look like a really shy weirdo. And I have had worse word farts in my past. So then you sit there for at least 10 minutes beating yourself up, "why did I say that?," "That was lame!" etc. And sometimes, if it was really embarrassing its much harder to shake off. It will pop back into your mind hours or even days later, haunting you. Luckily mine tonight was small and I'm already over it. Gotta love word farts.