Meno, as I remember (and I’m sure it has been told and retold in many variations, so the one that I read may not be 100% accurate) two girls came to Rav Kanievsky and asked him a shailah on a Rambam, and he responded by telling them to go to the kitchen and his wife would show them how to make potato kugel.
I was outraged the first time I read this, and then I read it somewhere else that said that their shailah was something really obvious that any yeshiva bochur could answer, and that it was clear that they were only coming to him to make some kind of statement and not because they really had a question. So that gave me some perspective. Still, I can’t imagine that his way of dealing with them was effective– if anything, it may have just encouraged them more.