The saying that a person is about to use before going off on a three-hour monologue about something that happened to them that you accidentally brought up.
You: How is your dog
Person: Funny you should ask
*3 hours later*
Person: that's how it all happened
You: can i go now
Person: Funny you should ask
*3 hours later*
Person: that's how it all happened
You: can i go now
by Trumps last name March 02, 2020