A mischievous trick-or-treater played a joke on President Obama during his final Halloween at the White House.

Obama greeted a child dressed as a “lame duck” during the annual trick-or-treat event on the South Lawn.

Obama (with mild enthusiasm) greets kid dressed as "lame duck" pic.twitter.com/IPF3bNHCTA — Kevin Liptak (@Kevinliptakcnn) October 31, 2016

It was perhaps an unwelcome reminder for the president, who has repeatedly rejected the “lame duck” label, that he will officially become one next week after his successor is elected.

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More than 4,000 people are expected to visit the White House for Halloween, including students from District of Columbia, Maryland and Virginia schools, according to the White House.

The president and first lady are handing out a variety of treats to children, including White House Hershey Kisses and M&Ms, cookies and kettle corn. The snack list also includes fruit bars, an homage to Michelle Obama Michelle LeVaughn Robinson ObamaMichelle Obama: 'Don't listen to people who will say that somehow voting is rigged' Michelle Obama and Jennifer Lopez exchange Ginsburg memories Social media platforms put muscle into National Voter Registration Day MORE’s healthy eating initiative.