An event in which someone gets re-acquainted with a favorite song, movie, or other thing from their past, but eventually
finds that it only reminds them of the time at which they got back into it.
My junior year of high school, I went up into the attic and found that Super Mario game I used to play when I was, like, 10 years old. But now when I play it all I can think of is how it was the one thing about my high school days that didn’t suck. What a total freaking nostalgia backfire.