The image below shows quite a few photos I have taken showing orbs with tail-like trailing ends. These "tails" are probably related to very fast motion of the orbs. See here for 88 photos showing such orb "tails." The photos were are all taken in completely dry weather, ruling out "falling raindrop" explanations. If you look both at this poster and my other poster of "orb tails," you can see that the direction of these "tails" are random, which is not what we would expect if they were being caused by falling raindrops.