Dialog

a: I think I have done something stupid.
b: Why?
a: I did not know it was going to be stupid when I did it.
b: No, why do you think it was stupid?
a: What was stupid?
b: The thing you just did.
a: How do you know it was stupid? How do you know what I have done?
b: Ok, sorry. What is it you have done?
a: Well, I woke up this morning, had corn flakes for breakfast, brushed my teeth...
b: No, no, the stupid thing.
a: Which stupid thing?
b: You said you thought you had done something stupid.
a: Well, why do you think it was stupid?
b: I do not. I do not even know what it is yet.
a: Aha! So you are accusing me of stupidity out of ignorance!
b: Look, I am not accusing you of being stupid. I do not know if you have done anything stupid. I am just trying to figure out what you have done.
a: Why? Would you like to repeat it?
b: I do not think so. It sounds like it was something stupid.
a: Surely not.
b: Ok, surely not.
a: -
b: -
a: So you want to repeat it?
b: I do not know! What was it?
a: Now, you are showing your ignorance again.
b: Ok, I am ignorant. You have done something, and I do not know it. But I have done things you do not know of.
a: Like what?
b: Well, like today, I brought my lunch sandwich in a glass jar, in case it would rain.
a: That sounds pretty stupid.
b: I suppose it was a little stupid. I fastened the lid so tightly that I could hardly open it again.
a: So you are the stupid one.
b: Well, I did one stupid thing, but you did something too.
a: What?
b: I do not know.
a: Stupid and ignorant. I do not know why I waste my time talking to you.