Under the Rain:
Most people assumed Roy Mustang disliked the rain, to put it mildly. Certainly everyone knew how mercilessly his Lieutenant berated him for being useless in it. Plus, the feeling of being unarmed couldn't make the General like the pretty raindrops.
Only Riza Hawkeye knew that rain meant a lot to her superior officer. For only with it was he able to simultaneously mask and show his true emotions. She knew why he visited Hughes' grave on rainy days, or made trips to Resembool in memory of the Elric brothers.
Only rain made him say what he never would under sunshine.