I was outside smoking a cigarette with my dogs as I very often am. It was dusk and the sky was overcast. As I was looking up directly over my head coming from over my left shoulder the clouds became disrupted. The only way to describe it was as if you were looking at the clouds through the heat radiating from a fire. It was cold outside and there were no fires burning. As this object kept moving forward I could see the cloud disruption took the form of a large triangle. It wasn't moving fast so I had a good 20 seconds seeing this triangle moving forward as it vanished in the distance. I swear to God I witnessed this. If anyone is interested feel free to contact me.