In Avengers: Endgame, Ant-Man proposes his plan to reverse The Snap:
Steve Rogers: Wait…are you talking about a time machine?
Scott Lang: No. No, of course not. No, not a time machine, This is more like, um…yeah. Like a time machine. I know, it’s crazy. It’s crazy. But I can’t stop thinking about it! There’s gotta be…SOME…..ugh. It’s crazy.
Natasha: Scott, I get emails from a raccoon. So…nothing sounds crazy anymore.
For her first Character Letter (mailed late 2019), @GroovyFrood wanted to see those emails!