A dark egg-shaped craft was seen going into a rain cloud over North Texas, according to a recent NUFORC report (case S139708):
Egg shape object over Lamesa, TX.
Although the witness apparently drew a photo of the UFO, no photo was attached to the NUFORC report, so much is left to the imagination.
Strangely enough, sightings of "egg" or oval-shaped UFOs happen from time to time. Consider a similar case in Kentucky in 2013, which detailed a gray oval-shaped craft hiding behind a cloud: