In the midst of taking a social history on an elderly male:
Patient: ...and my son Boo-Boo lives just around the corner and comes to see how we are doing at least every other day.
Me: Your son is named Boo-Boo?
(Quick definition: #1. A stupid or embarrassing mistake; a blunder or #2. A slight physical injury, such as a scratch)
Patient: My wife and I planned to have two children, but we had three and he's the youngest, so it's always been his nick name.
Me: Wow, that's a little harsh but funny! How old is he now?
Patient: He just turned 60.