When two people exit a room and enter another to get away from the rest of a group, people will follow them into the formerly empty room and draw in a crowd; this is often to the dismay of the first two individuals.
"Why did everyone follow us in here?"
"It's the Food Tent Effect, bro."
The opposite of health food. You go to a "green" market for health food, and you go to a burger joint for food that is guaranteed to raise your cholesterol level to the top of the Empire State Building and load you up with a week's worth of sodium.