Sarcasm wrrld on Instagram: "This video is a short, humorous clip showing a prank where people use a blade of grass to make a whistling sound that mimics a human cry or scream, startling passersby in a public area. The scene takes place on a sidewalk in a town center, with shops and buildings in the background. A man wearing a white t-shirt and a cap, who appears to be the primary prankster, stands casually next to a low planter box filled with long, thin-bladed ornamental grass. The first shot