Is That Serial or Cereal?

Last night, Dawn and I got into a discussion about mumbling. She does it a lot and it can be frustrating for me. Once upon a time, Dawn would get mad at me for constantly asking her to repeat things, but it really wasn't that I wasn't paying attention or didn't care. If I didn't care what she was saying, I wouldn't ask her to repeat herself, for instance. Anyway, the problem was that she mumbles a lot. Then last night after she mumbled something at me I started trying to recap some of why it's frustrating for me and I said something along the lines of "you do it a lot. there's mumbling, there's drive by mumbling, and there's serial mumbling." This lead to quite a bit of laughing, the kind of easy, happy laughter we haven't had near as much of as we might like or as we often used to. Dawn said she got the drive by mumbling (mumbling something at me as she walks by and out of earshot) but wanted to know whether it was serial like cereal and I said, no, like a serial killer - mumbling something and then mumbling again and again when asked to repeat.