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During a Juneteenth concert on the South Lawn of the White House on Monday, President Biden appeared to freeze up for nearly a minute while the people around him — actor Billy Porter, U.S. Second Gentleman Doug Emhoff, Vice President Kamala Harris — were dancing and clapping.

Watch the clip above.

The internet was quick to react to the strange moment, some poking fun at the POTUS while others seemed concerned.

“The White House lawn has never seen anything like this before,” Biden said at the end of the event.