It's best not to monkey around with Donald Trump - or maybe that's a bad choice of words.
The billionaire real estate mogul is suing millionaire comedian Bill Maher for $5 million.
Because Maher said - in jest, as comedians are wont to do - that he would donate $5 million to a charity if Trump could prove he wasn't the "the spawn of his mother having sex with an orangutan."
"I'm not saying it's true," Maher said told Jay Leno on "The Tonight Show" last month.
"I hope it's not true, but unless he comes up with proof ... I'm willing to offer $5 million to Donald Trump that he can donate to a charity of his choice - Hair Club for Men; The Institute for Incorrigible Douche-bag-ery. Whatever charity."
Maher picked the figure after Trump, long a skeptic of President Barack Obama's citizenship, offered to give $5 million to the charity of Obama's choice if the president publicly released his college transcripts in addition to his passport records ahead of last year's elections.