[entropicdrifter]

They were talking about frost build-up from freezing a large stein glass. If any frost gets onto the inner surface of a glass, it creates nucleation points.

[SoftTalker]

But wouldn't that frost melt immediately upon contact with the (relatively) warmer beer?

[hunter2_]

Maybe foam creation is also immediate, and wins that race to some extent?

[BigFnTelly]

I sure was, thanks for noticing