HBO host John Oliver and Cheerios are offering thousands of dollars in charitable donations, contingent on tweets from each other.

The back-and-forth began after Oliver, host of "Last Week Tonight," slammed cereal brands for their lack of innovation and creativity in a video posted online Sunday.

He expressed a particular dislike for Cheerios's chosen marketing strategy, saying that its official Twitter account "has fully submitted to the worst toothless impulses that dominate positivity Twitter."

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He blasted the brand for sharing empty phrases like "Families make good go round."

"They deliver empty nonsense like 'Good morning, today is yours,' " Oliver said while sharing images of the cereal brand's tweets. "No one looks to Cheerios for positivity."

The comedian then proceeded to issue a challenge to Cheerios, daring the General Mills brand to share a message that is a little less wholesome.

"I will donate $25,000 to the charity of Cheerios's choice if they simply use their official account to tweet 'F--- You.' I'll do it," he said. "I'll double it if they target the Twitter account of an actual non-famous, random user and do it."

He then returned to what he called the "larger point" of his argument, proclaiming that "cereal is in a rut."

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Cheerios responded to the challenge on Monday, declining to tweet using an expletive, but offering a donation of its own if Oliver tweets "Families make good go round."

Oliver had not responded to the counteroffer as of late Tuesday afternoon.