Restaurant chain gives away signature Grand Slam breakfast for eight hours . Patrons line up outside eateries , jam into booths with strangers . Score: Media outlets reported customers lined up outside the doors of many of Denny 's 1,500 locations . 6 Meal of pancakes , eggs , bacon , sausage reportedly packs 770 calories .
Restaurant chain gives away signature Grand Slam breakfast for eight hours . Patrons line up outside eateries , jam into booths with strangers . Score: 6 Meal of pancakes , eggs , bacon , sausage reportedly packs 770 calories .