A Latin or orthodox Mass, with 4 or more choral parts for the music.
Hearing about honest people who fight back and take out criminals, and law enforcement didn't harass the good guys.
Classical music, dark chocolate (85% cocoa or higher) and OLD, old port, or venerably aged whiskey.
Hearing of people celebrating high-numbered anniversaries, like 60 to 70 or more years together...
Bursting into a laugh together with my wife because we BOTH thought of the SAME thing at the SAME time, without saying it! (also works with a few long-time friends of mine when we all think along the same demented path simultaneously.)
Starting a new anime series and discovering a good plot, and handsome, beautiful, aesthetic characters, STEKKI costuming, accurately detailed scenes and settings, majestic landscapes and skyscapes.
Paying off a loan or debt.
Seeing something I designed out on the road, or in service at sea, or on the shelves at a computer store: I can look at the part and remember the day and the room I was in when that shape came out of MY PENCIL! I was There, man!
Watching a thunderstorm with some real punch to it. (Usually you have to be somewhere else than the Pacific NW.)
Running a craps table for friends, or at a game table at a con.
Cooking and serving a fine entree at a party at my house.
Low-angle daylight in winter.
Flying a kite.
This is a long list because I am often quite happy about a lot of things.
And not to mention: Thanks to all you guys too, Kumoricon staff and fans.
You have created so many timeless and priceless memories.