I saw the moon rising this evening, turns out it is nearly full (the full moon is on July 30th), so I quickly grabbed my longest lens setup and snapped a few pictures. Just out of curiosity I placed one on top of the other to see the difference and was quite surprised by just how much scintillation there really is (if you click on the picture and open the original GIF, it animated to flip back and forth between two shots). The scintillation is caused by a few factors including aerosols in the atmosphere, wind, temperature gradients in the atmosphere. The somewhat poor resolution can probably also be explained by atmospheric variations.
Update: Google in their infinite wisdom
Technical Specs: Canon Rebel XTi, 300mm f/2.8 IS + 2x TC, f/8 @ 1/200s, ISO 400.