Strange Disked Shape object flies over part of the town, then dissapears.When I was in my friend's back yard talking to him, i noticed an object in the sky to the south. The object looked like it was going Southwest.It was a silverish-white and it looked a little bit like a saucer. I kept on telling my friend "Dude look theres something in the sky." He kept on saying," WHERE?!", whenever I told him. He finally saw it, but then after a few seconds , it disappeared, not out of sight, but it just dissapeared. My two theories are : #1 it had some kid of cloak so we couldn't see it. #2 it accelerated at an incredible speed in a blink of an eye. We never saw it again. I am no longer a Montanan resident but i know it wasnt any planes we have around the airport outside of town. I truely believe it wasnt any plane. Just so anyone who reads this knows, my friend and I whitnessed the ufo for about 20 seconds.((NUFORC Note: Witness indicates that date of incident is approximate. PD))