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Joe Biden is the only person enjoying Trump’s transition.

While most everyone else, including the president-elect, seems to be in a foul mood amid the formation of a new cabinet, the outgoing vice president is having a ball, engaging in multiple consecutive days of trolling. Last night, he joked about making an improbable third run for the presidency against Trump in 2020—at which point Biden will be 77 years old. “I mean, hell, Donald Trump’s gonna be 74. I’ll be 77 and in better shape,” he told Stephen Colbert. “I mean, what the hell?”

Biden was even more provocative on Capitol Hill Monday, saying, “I’m going to run,” while also adding, for good measure, “What the hell, man.”

“I’m not committing not to run,” he told reporters. “I’m not committing to anything.”

No one’s quite sure what Biden’s playing at here, but maybe he’s simply resolved to enjoy himself in his final days in office. As I’ve previously argued, his legacy is better off if he doesn’t ever seek the White House again, but floating the idea is certainly one way to make sure he’s not forgotten in the administration’s waning days.

When NBC’s Kelly O’Donnell pressed him on a run as he walked into a meeting with House Democrats Tuesday, Biden smiled and joked, “I’m going to announce right now.”