Interview with Gregory M. Marcus, MD, MAS, author of Coffee Consumption and Incident Tachyarrhythmias—Reported Behavior, Mendelian Randomization, and Their Interactions, and Zachary D. Goldberger, MD, MS, author of Another Cup of Coffee Without an Arrhythmia, Please. Related Content: Coffee Consumption and Incident Tachyarrhythmias: Reported Behavior, Mendelian Randomization, and Their Interactions Another Cup of Coffee Without an Arrhythmia, Please Mendelian Randomization: How the Natural Assortment of Genes Can Mimic Randomized Clinical Trials Mendelian Randomization