Hmmm, OK, I'll bite...
My mentor teacher while student teaching. At the end of each school year, the kids got to go to the YMCA swimming four times (my mentor was also a lifeguard there, so the trips were free gratis for the school), and the last time we had to rush back to school for an assembly, so I didn't have time to wait for the kids to clear out of the locker room before I got changed, so she let me change with her in the private little room they had for lifeguards/volunteers. It was a little wierd, but whatever.