I looked up at the moon with several friends and family members and the moon would gradually get brighter for 30 seconds. It would stay bright for a couple minutes and then dim down also large dark spots randomly appeared on the visible part of the moon. I did some research and read that this might be a Transient Lunar Phenomena event but most of the descriptions were just small spots of the moon lighting up. The one I witnessed, the whole visible part of the moon got brighter. I confirmed it with other witness, so I know I'm not crazy. Could it be a Transient Lunar Phenomena and if so what were those black dots? The other witnesses keep annoying me and tell me it was a UFO, so any explanation would be nice to get them of my back.