that happened with me hearing the intro theme of the hanna Barbera Godzilla cartoon from the 70s. and the original Danger Mouse theme, and the music of the first doom game, ect.
I just went through a nostalgia trip from both watching Qubo/PBS Kids show intros that I saw when I was younger, and my god, I almost cried more than once. God when you get old, those shows become a distant memory, and some like Babar and Daniel Tiger's Neighborhood really got to me at times. I'm just glad I was able to go down memory lane for what could be the last time(I really don't know). May God bless you, wherever you may be right now.