Just because I don't look busy from afar - there's no commute, for instance, for the neighbours to witness - or from close up - never stick my tongue out of the side of my mouth, for instance, when editing - those around me are fooled into thinking I have time to tear down and rebuild their chimneys. Does this happen to you? It's only me, isn't it? I knew it. And if you said no to such a request, they'd accept it, right? Yup, it's only me. They wouldn't laugh at you if you offered to write out the instructions for mixing the mortar. They wouldn't say, "No, no, just come when you can."
I've got to start sticking that tongue out.