this is  VERY fancy hat which might or might not be a trash can lid 

When taking the attack action with a finesse or light melee weapon that you’re holding in one hand, you can use a bonus action to attack with a pot lid that you’re holding in the other hand. On a hit, the pot lid deals 1d4 bludgeoning damage. You don’t add your ability modifier to the damage of the bonus attack, unless that modifier is negative.