Well, this is sad: a man had an actual, real heart attack at the Heart Attack Grill in Las Vegas. The restaurant chain is known for its medical theme — servers dress up and are referred to as nurses — and its astronomically high calorie dishes. (Their slogan is "Taste Worth Dying For.") According to the restaurant's owner Jon Basso, there have been "a ‘variety of incidents' in the past, but this is the first full-scale coronary that happened in his restaurant."
Given that the man is as-yet unnamed, there is a chance that this is an (incredibly sad and evil) stunt. Apparently diners thought so and were taking photos, but Basso says "Even with our own morbid sense of humor, we would never pull a stunt like that." The local news report below does indulge itself a little bit, referring to Basso as "Doctor Jon" yet acknowledging, "Despite the clinical atmosphere, Basso is not actually a medical doctor, so he called 911." Basso "has heard" the man survived.
Video: Man Has a Heart Attack at Heart Attack Grill