Hang onto your receipt the next time you pick up a Taco Bell biscuit taco or A.M. Crunchwrap - some McDonald's are letting customers exchange them for a free Egg McMuffin.
It's just the latest salvo in what can really only be described as a battle of the fast food breakfasts between Mickey Dee's and Taco Bell.
Taco Bell's latest ad campaign for its own breakfast menu bluntly compares McDonald's breakfast to a dystopian regime ruled by Egg McMuffin clowns.
And McDonald's has started experimenting with a 24-hour breakfast menu in the San Diego area.
Noting this most recent move by McDonald's, one Janney Capital Markets analyst writes, "clearly, at least some McDonald's folks are concerned about the potential competition at breakfast that Taco Bell could provide over time - and maybe is providing right now."
Just last month, Business Insider noted McDonald's US sales dropped 4 percent in February - a fall much steeper than the 0.7 percent analysts had been expecting.