Hall of Infinite Doors

He extends his arm with a off white colored business card in his hand. As soon as you grasp it you feel a pulse travel through your body. You notice a large grin appear on the insurance salesman's face. Before you are able to ask him why he is smiling he vanishes leaving a cloud of violet smoke in his wake. You cough a bit and waft your hand to get rid of the smoke. You then chuckle to yourself and throw the business card in a nearby garbage can. As you walk away you reach into your pocket and pull out the business card you just threw away! Looks like you won't be getting rid of this card so easy. What shall you do?