Hackers claiming to be affiliated with Anonymous took advantage of the President's Day holiday on Monday to turn Burger King's Twitter account into what TechCrunch called "a Whopper of a mess."

"We just got sold to McDonalds!" the Twitter feed -- re-branded with a McDonald's logo -- announced at around 12 P.M. ET on Monday.

"BURGER KING® USA official Twitter account. Just got sold to McDonalds because the whopper flopped =[ FREDOM IS FAILURE?" the account bio said.

Subsequent tweets mentioned hacking groups like "LulzSec" and the Anonymous Twitter account @YourAnonNews. A link to a deleted press released on Burger King's official website suggested that the group hacked more than just the Twitter time line in what they called the "#OPMadCow" operation.

Burger King did not respond to a request for comment by the time of publication.

Burger King's Twitter account hacked