“Ooh, let’s try this. If I do this, you do that.” And we would just do it.
I won an Emmy on a Sunday night, and Tuesday at 9:30 in the morning, I was showing butt crack walking down the street. But the transition was frighteningly easy. Jim [Carrey] and I had met a couple times in the months leading up to [production], but we hadn’t done anything, so we just started shooting. Jim would just go, “Ooh, let’s try this. If I do this, you do that.” And we would just do it.
https://www.hollywoodreporter.com/news/jeff-daniels-two-faces-how-748596
Waiting For Charlemagne 