Texting the wrong number is not the end of the world and can happen to most of us. However, usually, the conversation is brief and explaining that is a misunderstanding, but in these cases, they were just to unexpectedly funny to block and move on.
You can’t expect to say something like this and then end the conversation: people need context and follow up. Too many questions.
A lot of people seem to get annoyed when they get a text that is not directed to them, but this person had a great sense of humor about it.