An armrest assembly for use on a folding chair. The armrest assembly has a molded plastic body with a top surface and an underside. A leg joint receptacle is present on the underside of the molded plastic body. The leg joint receptacle has two parallel walls, wherein a leg joint from the folding chair is received between the two parallel walls. A bottle opener is provided. The bottle opener has a base and a head section that extends from the base. The base is mounted to the underside of the molded plastic body, wherein the base directly contacts a wall of the leg joint receptacle. The wall of the leg joint receptacle reinforces the bottle opener, therein accommodating the significant forces that are transferred through the bottle opener when the bottle opener is used to open a bottle.