Elaborate make ups, cardboard folding, pumpkin carving, and what not - some of us go through great lengths during such festivities. Me? I'm lazy AF. So here's an A4 paper size-adjusted trollface which you can just print before cutting it out. Poke a hole at the eyes, the sides, and just string it up for your face! Add some blood if you wanna. Enjoy Halloween and happy trolling!
PS edit: Oh! I forgot to mention this: you need it pretty thick for this, so if A4 paper's all you have, just stack a layer of 3-6 papers. 1 layer wouldn't hold well enough.
