While everyone was watching the European championships I went to the kitchen and started cooking. Somehow I felt the urge to look out of the window which points towards west. The Sun was already setting and I realized a strange but perfectly disc shaped cloud below the average height. My phone was right next to me so I immediately took a picture,turned around to check the qualify and as I turned back to the "cloud" it had been completely vanished. I felt so baffled as not even 10 to 15 seconds had passed between shooting the picture and turning back to check if it was still floating.