As an interviewer, the worst candidates are the ones who just launch into a stream of words, talking and talking and talking with no break. Just a continuous stream of consciousness or memorized prepared pitch. Especially for the really open ended questions! It should be a conversation, not a one-way word salad.
I've had candidates answer the simple "Tell me about your background" question with a continuous 10-minute stream of words. I've more than once had to physically wave my hands and flag them down to stop. I've had a candidate who misheard part of my question and started answering something I never asked, and the candidate never provided an "in" for me to provide a correction and turn them in the right direction. Just non-stop words with no breaks. So many candidates do this. I don't know--are interview prep guides telling them this is a good strategy? It's not!