Burger King is forcing customers to go to McDonald's for one-cent Whoppers. Here are 7 of the weirdest deals and ads in recent fast-food history.

In 2015, Burger King launched a Halloween burger made with a black bun that turned people's feces a greenish color.

Despite people's bathroom-related freak-outs, the chain has doubled down on scatological deals, launching the Scary Black Cherry slushie this year. And, many customers reacted with eager anticipation around what color their poop would be after drinking.

Read more: Burger King has a new spooky black slushie, but all people can talk about is how it's turning their poop weird colors

In 2017, Burger King launched a TV ad that triggers people's Google Homes with the command, "Ok Google, what is the Whopper burger?"

When Business Insider tested the ad, Google Home recited the definition of a Whopper burger from its Wikipedia page. However, someone had edited the Whopper's Wikipedia page to say that the burger is made of a "medium-sized child," instead of a beef patty, and that it contains the toxic chemical cyanide.

Burger King edited the Wikipedia entry and won an award at Cannes Lions for the ad.

Read more: Burger King's newest TV ad has a disastrous flaw

In 2017, Taco Bell announced a service that allows Lyft users to push a button to have their driver take them to a Taco Bell drive-thru.

Many Lyft drivers — who found out about the new service at the same time as the rest of the world — were less than pleased. Drivers started airing their grievances with the so-called "Taco Mode" on a driver message board called Uberpeople.net.

"Vomit bags & plastic seat covers for all seats in vehicle. The drunk-circuit shift suddenly became a three-ring circus," said a San Francisco driver.

Read more: 'UBER-TYPE BEHAVIOR': Lyft drivers are furious about the company's new Taco Bell drive-thru service

In 2016, the chicken chain gave away 3,000 free bottles of Colonel Sanders' Extra Crispy Sunscreen.

"Suntan lotion always smells like lotion," KFC CMO Kevin Hochman told Business Insider. "So we thought — why not make it smell like fried chicken?"

Read more: KFC just unveiled an absurd new product: chicken-scented sunscreen

In June, Domino's announced a campaign to repair potholes. The company is already working with local governments in Bartonville, Texas; Milford, Delaware; Athens, Georgia; and Burbank, California, to repair roads, filling potholes and stamping the repairs with a Domino's logo.

"We don't want to lose any great-tasting pizza to a pothole, ruining a wonderful meal," Russell Weiner, president of Domino's USA, said in a statement. "Domino's cares too much about its customers and pizza to let that happen."

Read more: Domino's is repairing roads, and some people say it reveals a 'dystopian' truth about America

IHOP tapped into the bizarre deals that dominate the burger industry this year. In June, the International House of Pancakes temporarily changed its name to the International House of Burgers, or IHOb.

The move sparked backlash but ultimately drove burger sales at the chain. According to IHOP, hamburger sales quadrupled following the promotion, contributing to a significant lift in lunch and dinner sales.

Read more: IHOP's burger sales quadrupled after its controversial IHOb name change

In 2017, Denny's took to Twitter to respond to people who said the chain's sausage mascot looks like something far less savory.

The chain's Twitter account posted an image of the sausage and a slice of bacon, with the caption "i'm just a sausage... i can't help the way i look."

Denny's sausage mascot has been used in marketing since 2014, when the chain debuted its "Grand Slams" gang of mascots. The mascot's name is "Sausage" and is distinguished from other sausages (or turds) by his arms, legs, and jaunty hat.

Read more: Denny's responds to Twitter users who say its mascot looks like a 'turd'