I'll try to give a serious answer to the original question...a long time ago I worked on Wall Street and had to deal with margin issues quiet a bit. At the time, the way margin loans worked was you could borrow up to 50% of the value of the purchase and then you had to maintain the equity level at 35%. So if you bought $100,000 of stock, you had to first come up with $50k. If the stock then dropped to the point where your debt represented 65% or more of the then-current market value of the stock, you had to come up with more money or you'd have your stock sold to pay off the debt. In many cases, the margin requirements would be much higher than 35%. This would have been the case for thinly traded stocks, low priced stocks or stocks that were deemed excessively volatile. It was also something we imposed for insiders, if we'd even allow a margin loan on that kind of purchase. Sometimes the margin ratio would be 100% (meaning you couldn't have any debt against the stock).
I don't know whether the Goldman loan was a margin loan or whether it was something else, but I wouldn't be surprised to find that the loan is secured by assets other than Tesla stock.