Abstract: A coaster configured to engage another object, specifically a coaster or coaster-like device with means to attach to another object including an object with which is it meant to interact. In a preferred embodiment, the coaster contains a magnetic material capable of engaging with another magnetic component—a soft or hard magnet, an electromagnet or other magnetic material—located on or within another object. An additional magnet can be integrated into or attached to the coaster. The coaster can be imprinted with any number of designs, logos, or custom artwork making them an attractive vehicle for marketing efforts or imprinted with game boards or other graphics integral to user interaction with the host device.

Abstract: A system for deterring the placement of a foreign substance in a user's beverage and for alerting the user to such attempts including a sensor that detects movement or agitation, such as an accelerometer, contained in a substantially flat housing, preferably configured to provide a surface on which a coaster and/or a beverage can rest. Said system includes means for the sensor to transmit data to a processor that is enabled with software capable of communicating with an external device or activating an alarm system associated with the housing.