A customer eating a "triple bypass burger" at the Heart Attack Grille in Las Vegas ... may actually need one:

A man who scarfed down a burger and fries at a Heart Attack Grill restaurant in Las Vegas over the weekend actually suffered a heart attack mid chew, authorities said.

Witnesses said the man, who was in his 40s, was grubbing on one of the grill's notorious "Triple Bypass Burgers" when his symptoms started.

Link (Photo: Matt York/AP)