seeing any leaf that looks similar to the leaf you see in animal crossing when dropping an item outside. if i see a leaf that resembles one, i always have to double check because my mind goes straight to AC. then i try to keep it in my pocket for the whole day so i can pull it out at some point and make a lame joke about it.
I know I played too much ACNL when I start bribing artists for money to draw my AC mayor/characters and making mini-dialogues or headcanons about them. Also buying the authentic Sanrio cards which blasted $200 away from my savings.
Maybe not so much too much Animal Crossing, but too much of this forum. I considered asking someone if they wanted tbt for some amiibo cards I wanted, then I realised they probably wouldn't want some virtual currency in exchange for amiibo cards lol. Or they probably wouldn't even know what tbt is!
But yeah, the reason why I can identify bugs and fish, and give out random facts about them, is because of AC!