Today at C++ Connections I have attended two Bjarne Stroustrup talks. And yes, I learned something from both talks and took plenty of notes. Bjarne used what he called Ye Olde Shape Example in a discussion of the brittle base class problem. He mentioned that this is an ancient and yet still useful example that he got from the Simula folks way back when. After the talk I asked if he knew when it dated to, since I use it as an example of polymorphism in the OO/UML course I teach at Trent. He thinks it's about 1971. I was disappointed that it wasn't older than me, and he offered "well, there's always the cars and vehicles, stop, go, turn kind of thing. That's from about 1967 or so." I burst out laughing since I use that example too! It doesn't quite make the "older than me" bar, but it's certainly got a history.