Warfarin (Blood Thinner) Key Ring

Warfarin is a blood thinner that was originally used to kill rats. Warfarin is now used for many conditions that require thinner blood for example, strokes, blood clots and other diseases. If the person you know has a sense of humour then they will love to have this gift. They will already know that Warfarin is used as rat poison and will find it ironic that it is keeping them healthy, brighten their day by sending a humourous gift.