I had an interesting experience this weekend, and figured that I'm sure similar things have happened to other girls on this forum, so here's the thread!
What charming, completely unnecessary but hopelessly gallant things have men or boys done for you while you are presenting as female?
Here's mine: Last night my girlfriend and I spent the day decorating for Halloween with her son, her daughter, and her son's girlfriend along with my daughter (who I am now out to). I was presenting as female in this family situation all weekend and enjoying it immensely.
We spent a couple of hours digging "graves" and mounting styrofoam headstones, and my girlfriend's son asked me if I had some old lumber in the back so he could make a partially buried "coffin". I told him I would look, so we went back and I found an old wooden box I had built years ago mouldering in the wood pile. I dug it out, being careful not to mess up my skirt (I was overdressed, but my long, thick jersey skirt was *perfect* for a cool day, and I was not about to miss a chance to wear it!

To set this up, let me remind everyone I'm nearly 40, 6'4" tall and about 180 pounds, very little fat. I'm a big girl. My girlfriend's son is, well, 21, about 5'8", maybe 130 pounds soaking wet in gym clothes.
After producing the box, I set it on the ground and showed it to him, and he said he thought it was perfect. I picked it up (all twenty pounds of it) with the fingertips of my left hand and prepared to take it up to the front when he said "That looks heavy, let me get that for you", whereupon he took the box in both hands and carried it through the house to the courtyard.
It was all I could do not to laugh, but at the same time his unexpected gallantry made me all misty-eyed. I love that kid.