Scott Lang: Somebody peed my pants. But I don’t know if it was “baby” me or “old” me. Or, just “me” me.

Bruce Banner: Time travel! What? I… I see this as an absolute win.

(Later…)

Tony Stark: Why the long face? Let me guess, he turned into a baby.

Steve Rogers: Among other things, yeah. What are you doing here?

Tony Stark: It’s the EPR paradox. Instead of pushing Lang through time, you might’ve wound up pushing time through Lang.

From Avengers: Endgame (2019)