Disk-like sightings in the daylight.
Daylight disks should only be taken seriously if all of the following are true, 1) reputable witnesses exist, 2) the original negatives are available for study, 3) the camera is available for study, 4) the owner of photo will testify under oath to the genuiness of his/her snapshots.
Radar and visual UFOs.
Close Encounters of the First Kind - Witness and the sighted observed less than 500 feet apart, but in which no interaction of the UFO with the environment or the observer is reported.
Travel Log | Reference
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