Book some time and rotate with them. It's cool, they get to watch you flying around and see what's possible once you have your body under control - without the concentration overload that happens the first time they ever get in the tunnel and they realise it's REALLY WEIRD.
If that's all that happens, then you've still shared the experience. Or if it's all going really well, the instructor might ask you to come in for the last flight or two
[edit: I got to fly with my Mum a while ago in just this way, it was priceless ]
(This post was edited by Joellercoaster on Oct 25, 2011, 4:45 AM)