Thomas C. Dillon, a former political adviser to U.K. Prime Minister Boris Johnson, shared a clip of the bizarre encounter on his Twitter page Monday.
As the White House Easter Egg Roll was underway, Biden could be seen off to the side talking to a reporter.
"Pakistan should not, and Afghanistan should be…" President Biden can be heard saying before the "Easter Bunny" approaches.
"Oh, the Easter Bunny!" someone can be heard saying off-camera.
The Easter Bunny gives the president a big wave to usher him away as a visibly annoyed Biden appears caught off guard. He was reportedly needed to kick off another round of the egg-rolling competition by blowing a whistle.
"Joe Biden quickly interrupted by the Easter Bunny after he starts to comment on #Afghanistan and #Pakistan at the White House #EasterEggRoll," Dillon tweeted.
It remains unclear who was inside the bunny outfit.