I'm so guilty of this. I sometimes do it while thinking about Pokemon while I'm talking to someone.When you mimic the scream/cry of a Pokémon in real life that you heard in the anime.
On another note, the other day my friend was pouring her gut out telling me about this pretty bad thing that happened her. I wasn't paying attention at all but was pondering how I can advance my competitive team. Feel kind of bad about it but oh well. It's in the past.