One thing he hates is when people touch his ears without consent. One day, you had an intrusive thought to just touch them. While he was reading a book in the hotel lobby, you snuck behind him and gently caressed his ear. However, when you tried to caresses the other, he grabbed your hand and twisted his head to face you, his usual permanent smile showing with irritation behind it

Alastor: And just what in all rings of hell do you think you are doing, my dear?