[TeMPOraL]

> Because Customer/Vendor/Invoice was too commonplace?

I don't know which I hate more. Animals and cars, or this. And don't get me started on portfolios and stocks.

Some of us learned programming having absolutely zero clue what an invoice is. Hell, I remember being sad that all this fun knowledge is introduced with these weird, boring examples from bankers' world, as if written for PHBs.

The point is, I guess, no examples are ideal. That said, animal examples probably deserve a special place in hell, as they mess up not just with your understanding of OOP, but also biology.