With a friend in Forge mode, spawn a Brute Shot and have the player who is not the host turn into a Monitor. Have the host remain a player while the Monitor looks at the Brute Shot as if they are going to pick it up. Have the player look as if they are going to pick up the weapon, then do a countdown to have both players take the weapon at the same time. This may require a few attempts.
When doing the "Weird Hand" glitch, try shaking the weapon to make the person's arms disappear.