I'm still having a persistently consistent run in with HR for various reasons; this [i] may [/i] just colour this a tad....
(I know you understand the Geordie knack of understatement....)
My recent shots at them include asking questions over and over again...
"What do the current Employement Laws state about that? What section does that refer to? Are you sure that's not in The Human Rights Act 2000, too? Which of the Acts takes precedent?"
Oh, I hope I'm annoying them intensely, that's the aim of the game right now.
Polite insults? To HR? They'd go way over their heads. Be as subtle as a brick - that'll work.
One question that is almost guaranteed to flummox HR staff: Can I ask interviewees when their religious holidays are? If you need the answer, PM me, cos it's complicated!
Enjoy, Tony. I think you'll be able to come up with plenty of insults on your own, btw!
GG
Edit: of course, you know to do the old Joe Pasquale one, don't you? Just hum "I know a song that will get on your nerves, get on your nerves....." Gets to someone in the room every time...
Only remembered it cos my boss has just done it to ME! :p