یادش بخیر / yadesh bekheyr / what a good memory that was!
Iranians use yadesh bekheyr when they are reminiscing. I can imagine my parents saying, "Yadesh bekheyr when the kids were still at home, and we used to take family trips together!" Or, "Remember when we were kids, and the ice cream truck used to come around and we'd all run out to buy ice cream. Yadesh bekheyr. We had no responsibilities back then... just homework."
You can also use it when talking about someone who has passed away. "Yadesh bekheyr my grandmother always made the most delicious food!"
Instead of recording the word today, I'm going to leave you with another video. Because nothing helps you (or maybe I should say me) remember a word better than hearing it in a song! Here is Yadesh bekheyr from The Boyz.