"I expect him to joke that you may only store your motorcycle here if it is sufficiently awesome, but not to actually complain regardless. Also, it may be relevant that Sunnydale High is built on top of a Hellmouth - the site of a currently dormant gateway to a hell dimension. It is the reason why Sunnydale is such an epicenter of magical and demonic activity, but most of the time its exact physical location makes very little difference. I don't expect it to have anything to do with why Sherlock is late, but I can't rule it out."