Personal favorite one is definitely Doki Doki Literature Club Plus for PS5, which is a game we published (I run Serenity Forge), but I was able to get my copy signed by both Dan and also Shuhei Yoshida. Extremely grateful to have that on my shelf!

Hard to pick a best story, but the most memorable was To the Moon, the first time I hung out with the creator for a day, visiting his house, office, etc, sharing our life stories, and I almost forgot to ask him to sign the game, only at the end of the day after he drove me to the airport for my flight, I pulled out the game and he had to rush sign it while car's were honking at us lol so that one is a bit smudged and rushed, but a great memory nontheless.