This week on "Real Time," Bill Maher has a new rule for people who text. Specifically, people he doesn't know.

See, if you send Maher a text message (which we're sure you do, often) and you don't tell him who you are, he's not going to know what your ambiguous "hook up" message really means. And let's face it, "hook up" can mean a lot of very different things.

"Real Time" airs Fridays at 10:00 p.m. EST on HBO.

Also on HuffPost:

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  • The View

    Elisabeth Hasselbeck takes issue with something Maher said about her on his show.

  • The O'Reilly Factor

    Maher and O'Reilly debate religion on "The O'Reilly Factor."

  • The Late Show With David Letterman

    Bill Maher wants to know why everyone is listening to Donald Trump.

  • The Tonight Show With Jay Leno

    Bill Maher vents about Rick Santorum.

  • Piers Morgan Tonight

    Maher discusses gun control and and his Obama Super PAC donation with Piers Morgan.

  • The Daily Show

    Maher discusses Scientology and religion as a whole with Jon Stewart.

  • Late Night With Jimmy Fallon

    Bill Maher explains why he can't stay at Trump Hotels anymore. (Check out <a href="http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&ved=0CGYQtwIwBA&url=http%3A%2F%2Fwww.hulu.com%2Fwatch%2F302019%2Flate-night-with-jimmy-fallon-bill-maher-part-2&ei=ZRO0T-ukNa7k6QG-uPn5Dw&usg=AFQjCNEkgbRKzEwzA5GVHOk53pGTNZBZJQ" target="_hplink">part two here</a>)

  • The Late Late Show With Craig Ferguson

    Craig Ferguson tells Maher why he doesn't like politicians.

  • Hardball With Chris Matthews

    Maher talks about all the material Rick Santorum has given him.

  • Conan

    Maher talks with Conan about Obama's endorsement of gay marriage.

  • Anderson Cooper 360

    Maher discusses President Obama and the GOP field.