Other people have given me a hard time for using that as the metric for when they're done. It's not my fault they interpret it as me drowning the cookie.
I’m surprised Oreo hasn’t done a Halloween ad campaign about how people eat their cookies: Hold it under until the bubbles stop, twist its head off, eat it in tiny nibbles.
I like to bite off just a little of the top and bottom of the sandwich cookie to aid in airflow/flooding, since the baked finish is sometimes nearly air tight.