Teaching and Student Practical Scenarios

I'm just wondering how many of you (and how often) get asked to participate in teaching situations?

My psychiatrist is a teaching doctor at the local university college of medicine. Every so often I am asked to be a subject in a teaching scenario. Often it is simply being interviewed about my experience with my mental health. Sometimes it is an interview about my experiences with the health care system. Sometimes it is role playing (ex. I pretend I am presenting myself to the ER and the student conducts a practise intake assessment).

Though anxious I actually don't mind doing this - besides, I get paid to do so.

But how many of you out there get opportunity to do the same? Do you accept the invitation to do so?