Tesla's stock has been falling — but don't try to figure out why (TSLA)

Tesla shares have dropped over $20 this week, after hitting a new high, threatening $400 at one point.
On Thursday, shares closed at $366, down 2%, and on Friday the stock was slipping further in pre-market trading.
So what gives? 
Nothing, really. Tesla revealed that it will discontinue its cheapest Model S sedan option, the rear-wheel-drive choice with a 75 kWh battery pack, but as my colleague Danielle Muoio reported, that was expected, and Tesla has dropped less expensive