UFO sightings are commonplace, and videos of unexplained objects are made every day. It is not every day, however, that an object appears over a large city and remains unidentified. This is what happened on August 12 over Houston, and so far the large object ringed with lights remains unidentified. It is possible, of course, that it is a large drone being flown by a hobbyist/hoaxer, but the device would have had to have been at least 50 feet across, larger than any drone that can be bought off the shelf.
If this was a genuine unknown object, it has features reminiscent of one of the Hudson Valley UFOs that were seen in the early 1980s in upstate New York, specifically one that appeared with lights flashing around its periphery. Such a UFO had been reported by local people in the weeks prior to Whitley Strieber's famous 1985 encounter, but was unknown to him at the time.
Another mass UFO sighting, the Phoenix Lights, was accompanied by sightings of a large triangular object that traversed the region. The lighted triangular object passed over the whole state of Arizona on the night of May 13, 1997. Governor Fyfe Symington, who initially debunked the incident, later admitted that he had personally been a witness, and that the triangle was 'otherworldly.'