Because he probably should have left a note.
"I'm sorry, Mr Miller, but there's nothing I can do;
The computer says you're not allowed to drive."
"What's the matter? Was my application not quite up to scratch?"
"No. It's you. You're not... sufficiently... alive."
I have been almost indescribably busy with work and other non-bloggy things. But this was simply too delicious not to put here:
Thanks for the link, Patrick Stokes.