I'll kick us off with an absolute banger...
Boyzone - Love Me For A Reason
I was like 6. I wanted it desperately. Listening back to it now, as a 36 year old man I can admit that it's an absolutely horrible bit of music....but it still takes me back to being a young kid.
I bought Hybrid Theory and Blizzard of Ozz both on CD on the same day I bought my Walkman CD player. 10/10 purchase, made riding my Razor scooter to school hard core.