Koro-sensei: Imagine if someone handed you a box full of all the items you've lost throughout your life time.
Karma: Oh wow, my childhood innocence! Thanks for finding this.
Itona: My will to live! I haven't seen this in years!
Nagisa: I knew I lost that potential somewhere!
Kayano: Mental stability, my old friend!
Koro-sensei: Guys, could you lighten up a little?