Sometimes I'll ask someone "what?" as in "repeat what you just said" and by the time they start repeating, my brain will have parsed the previous sentence and I want to tell them "nevermind" but I don't because that's embarrassing so I have to listen to it again.
Yep! Just as common for me to start responding to the initial comment before they’re even able to start repeating themselves. Just reflexive “what?” from me all day, people hate it (me)