This happened some years ago when I was in uncontrolled airspace and need to clip the corner of some class D: In New Zealand all glider registrations start with G
Me: "ROT tower, this is GML. Overhead xxx at 4500', request clearance to transit direct to yyy."
Tower: "GML: Please Orbit and maintain height and position"
Me: "Tower: This is Glider ML. I can orbit, or maintain height, or hold position. Please choose one."