In the car, having just picked up the Kid and on our way to get Little Miss:
The Kid: So, I tried a new word today that I'm not supposed to say.
Me (wincing): Oh really, what was it?
The Kid: It was fuck.
Me (don't react, don't react, don't react!!!): Oh...well, we probably shouldn't say that one. Do you remember where you learned that word?
(Please don't say "from you", please don't say "from you", please don't say "from you"!!!)
The Kid (thoughtful-like): You know, I think I made it up.
Me: OK, well let's try not to say it. (Trying to recover.) How was the rest of your day?
The Kid: Well, it was not very good, because something from the toilet ended up on the floor.
The Kid (resignedly): It was poop.
Me (tell me the pre-school gossip, dude!): Who pooped on the floor?
The Kid: Not on the floor. On the shelf with our new works.
Me: But who did it?
The Kid: Well...nobody knows.