You know how sometimes the last sentence you said kinda echos in your brain? and it just keeps sounding stupider? and you have to say something else to make it stop?
Kinda like in the movie Dan In Real Life (one of my top 10). Steve Carell runs up to a girl who just gave him her phone number and says “I would even call to say I’m not calling.” Which he then repeats to himself with a feeling of utter stupidity.
Or I told the security guard “you too” when he said “have a good flight.”