$Tesla Motors(TSLA)$ Surges 12% in a Single Day, Biggest Rally of the Year After Two Weeks, Here's Why ......1. Short Squeeze (Short Squeeze was actually pretty much last week); 2. Gamma Squeeze. not uncommon with Tesla's volatility.Below is the March 19th, TSLA's Charm Exposure for the March 28th expiration (which in this chart refers to the overall sensitivity of Tesla's option positions to Charm)An option's Charm (a.k.a. Delta decay) is a second-order Greek letter that measures the rate of change in an option's Delta value over time.Specifically, it reflects the extent to which the passage of time affects the option's delta if the price of the underlying asset remains constant.Charm = ∂Δ/∂T (Δ is Delta and T is the remaining time to expiration)