Actor Kal Penn may be most well-known for his role in the comical "Harold and Kumar" film series, but he has also served as an associate director in the White House Office of Public Engagement. 

Last night at the Democratic National Convention, he took the stage and spoke in support of President Barack Obama. During his speech, he also decided to poke fun at actor Clint Eastwood.

"I've worked on a lot of fun movies, but my favorite job was having a boss who gave the order to take out bin Laden, and who's cool with all of us getting gay married. So thank you, invisible man in the chair, for that," Penn said, drawing laughs from the crowd. And for giving my friends access to affordable health insurance and doubling funding for the Pell Grant," he continued.

At the Republican National Convention last week, Eastwood gave a surprise speech, in which he addressed an "invisible" President Barack Obama, using an empty chair as his prop onstage.

"Well, I know even people in your own party were very disappointed when you didn't close Gitmo.  And I thought, well closing Gitmo -- why close that, we spent so much money on it.  But, I thought maybe as anexcuse -- what do you mean shut up?" Eastwood said while onstage.

The interesting speech and prop immediately caused a frenzy on the Internet.

A Twitter account "Invisible Obama" was created, and in the bio, stated that it was located "Stage left of Clint Eastwood," and that "The GOP built me." An hour after Eastwood's speech, the account had 20,000 followers. Twitter users immediately began to post pictures of empty chairs, along with the caption, "#Eastwooding."

Even President Obama joined in and tweeted a photo of himself from his official account @BarackObama.In the picture, the president is sitting in his own chair with the caption, "This seat's taken."