Subscribe | UPI Odd Newsletter Subscribe Nov. 28 (UPI) -- A Massachusetts man captured video when he investigated the source of a strange sound and found a turkey knocking on his window. Bryan Seastead posted a video earlier this month to YouTube, showing what happened when he investigated the knocking sound coming from a window at his home in Sudbury. Advertisement "I heard a knocking on the window and took out my phone thinking it was something peculiar... and worth recording," Seastead said. The source of the knocking turned out to be a turkey repeatedly pecking at his window. The turkey may have been fighting its own reflection, mistaking it for another bird, or it may have been trying to gain the attention of Seastead's cat, which was lounging nearby. Seastead said the scene was "unreal." Read More Turkey crashes through window of orthodontist's waiting room Police warn of aggressive turkeys after flock chases patrol car Stamford residents intimidated by aggressive turkeys