Happened a few days ago. This thing is going to 73. All the stars are aligning. The drop is because the shorts bought the 39 calls for 1.95 = 41.95 and the option sellers don't want to give them a penny. The shorts lose either way.
For the options sellers not to give them a penny means another day below 41.95, ...and I'm not sure we will sit below that number much longer. We shall see in a few hours, but either way, Friday and/or Monday will be interesting to say the least, and we will definitely be more up than we are now!