The scariest offer: Burger King's Nightmare King, a combo of beef, chicken, cheese, bacon and onions scientifically determined to increase nightmares.

With food prices so unpredictable, alcohol prices have remained relatively stable, and the chain can make a profit even on $1 drinks.

Starbucks, Famous Brands and Restaurant Brands International are among those "improving treatment of egg-laying hens around the world."

The chain is testing a digital system through which salad or bowl ingredients will be added automatically. But humans still add the final touches.