You could give them some mild spaghetti, and ask how they'd try to improve the code. I think one reason why what you did doesn't happen more often, though, is

You could give them some mild spaghetti, and ask how they'd try to improve the code. I think one reason why what you did doesn't happen more often, though, is because they wouldn't have the freedom to reimplement in a language they felt was more suitable.