In an important discussion going about, usually I tend to zone out.
Speaking in a meeting, attending a client call, even in a friendly discussion standing tall, when my girlfriend blabbering on issues so small, I tend to zone out all.
When It gets boring, I feel like dozing, too lazy to make stubborn people mind's restoring, I stop explaining, keeping to myself abhorring. that's why I zone out, everything just ignoring.
Does that happens with everyone, I seriously doubt! But yeah sometimes I tend to zone out!