I hate having to listen to them. In fact, I'll start answering the person's voice sometimes. They look over annoyed like "You're interrupting my train of thought" and that's when it hits them....on a delayed basis....yeah.
Phone Dude: "Hey man, I'm walking to class."
You: "Hey man, nobody cares."
Phone Dude: <Looks annoyed...stares...irritation slowly becomes horror>
"My life...is a sham..."