In the interview, Berry revealed that not even executive producer Jemaine Clement can remember how it happened. “It’s probably something where I felt that the scene had to end kind of naturally,” he said, “and it was my way of getting out of the scene. It’s like the improvisations started to kind of dry out. So I thought, ‘Screw this, I need to get out of there.'”

Demetriou remembered it, though, saying, “I remember where the first ‘Bat!’ came from. I could be mistaken, but we were on the bridge in that park in L.A. for the pilot. And then it was like, ‘Right Matt, so you’re going to bat away,’ and so you just went, ‘Bat!'” Berry added, “It’s always funny if someone says the thing that they’re going to do. That’s probably why I said it.” Demetriou replied that she was “dying with laughter” at the time and that it wasn’t in the script.

I remember watching the first time Berry said it and thinking “That is so stupid,” while laughing until my eyes teared up. Try explaining why a single word is funny to someone, though. It doesn’t work, so I’m just going to request that you watch the first episode. 

“What We Do in the Shadows” is currently airing its fourth season (along with the earlier ones) on FX and Hulu. It has already been renewed for seasons 5 and 6.