Wowwww! Crazy story, thanks for sharing.
It’s not just tax returns where I’ve seen this behaviour in others… it’s whenever people get paid back for things (e.g., one person bought all the concert tickets, and when we each pay our share, she considers it free money. Or when you up front for a health thing, and finally the insurance pays you back). This is not free money! This is your own money, finally returned!