lane closed

I love my kids. I love interacting with them, listening to what's on their minds. However, it seems like all day yesterday, I did not experience five consecutive minutes without hearing my name (Mom) called in request for help of some kind. Usually for food. This really gets me when I'm on the phone or talking in person with someone (they have been taught OVER and OVER and OVER and OVER and OVER and....that if I'm SPEAKING or LISTENING to another person, that they need to WAIT their turn and not interrupt - unless there is blood involved, of course.) I get real tired of having to stop and tell them that they're interrupting and to wait. I do realize that part of the problem is me failing to give a consequence when this habitually happens, but also that sometimes the kids are just one track minded and so focused on what's in their little brains that they forget. So I was thinking how handy it would be to have a light on top of my head that would automatically be "on" if I'm free to talk or answer questions, and "off" if I'm engaged in conversation with someone else. Lane closed. Find another lane. (DAD's lane, perhaps? :) I'll bet I'm not the only mother who would invest in such a gadget.