What is a "left turn without signaling"?

I feel, at any given moment, that I have a half dozen or more tasks going on, a dozen or two people I am taking care of, a to-do list that grows at an alarming rate and never gets smaller, and there is a tag cloud in my head that goes on and on and on and on. I am not sure if this is common to everyone, if it applies more to my generation, if it is a product of today's overloaded information, or if it is just me and some of my peeps. So, what is a 'left turn without signaling?' The phrase actually comes from my friend, co-teacher, and neighbor who has a tendency to go off on tangents or change the subject of our conversations suddenly, just like me. We can be at school talking about science lesson plans and one of us remembers something we saw on the way to school or something we watched on TV last night and the conversation goes in a totally different direction than we planned. This sudden and complete change of direction is what we call a "left turn without signaling". A 'left turn without signaling' (LTWOS) happens when you are talking about one thing and something you say triggers you to think about a funny story that happened at home that, in your brain at least, is related to what you were originally talking about.

It's all connected, in your brain, and the sudden change in topic makes sense, in your brain, but usually not to everyone around you.