[chris_wot]

Yeah, but another valuable skill is knowing that if you are treated this badly in an interview that even if you really want the job, sometimes it's best to walk away.

[Mendenhall]

I would probably politely ask the person if they were acting like a clown as an interview technique or if they were in fact an clown. No need to bother with disrespectful people.

[caminante]

Good point

...and that's in the book! ;-)

edit: I think the key is that there's a dominant technique, regardless of whether you're getting trolled.