One idea I have is an Evening ID, where a field of grass becomes infested with cow spiders. The inspiration came from here: https://www.youtube.com/watch?v=FavUpD_IjVY I would call this one Infestation. Another idea I have is a Night ID, where a brown sheep is seen walking around a road. The sheep then splits in half (not in a grotesque way though), revealing a wolf that growls continuously. I would call this one A Wolf in Sheep's Clothing. Feel free to use these ideas.
Credit to Corus Entertainment and cyriak.