[vacri]

I have a great mentor who will often lead me up the garden path and get me nodding with him, then scuttle his own argument and let me know why it's bad. It's part entertainment for him (and me), part making me think before blindly agreeing, and partly history lesson/why they went this way.

Done properly, it's fun, though you do need some form of ongoing trust - it's not something you should do to someone piping up for the first time on IRC.