On Wednesday, New York Times opinion columnist Paul Krugman claimed someone broke into his computer and downloaded child pornography.

“Well, I’m on the phone with my computer security service, and as I understand it someone compromised my IP address and is using it to download child pornography,” Krugman wrote in a tweet. “I might just be a random target. But this could be an attempt to Qanon me. It’s an ugly world out there.”

Krugman added, “The New York Times in now on the case.”

Later, Krugman deleted the tweet.

Skeptics replied to Krugman’s tweet, some calling him a liar. Some used the opportunity to make fun of Krugman.

In November 2016, Krugman, a Nobel Prize winning economist, predicted a Donald Trump presidency would cause a world wide recession.

“Under any circumstances, putting an irresponsible, ignorant man who takes his advice from all the wrong people in charge of the nation with the world’s most important economy would be very bad news,” Krugman wrote in an opinion piece for New York Times. “What makes it especially bad right now, however, is the fundamentally fragile state much of the world is still in.”

“Now comes the mother of all adverse effects — and what it brings with it is a regime that will be ignorant of economic policy and hostile to any effort to make it work,” Krugman wrote. “So we are very probably looking at a global recession, with no end in sight. I suppose we could get lucky somehow. But on economics, as on everything else, a terrible thing has just happened.”

Krugman is well known for his 1988 prediction: “The growth of the Internet will slow drastically, as the flaw in ‘Metcalfe’s law’–which states that the number of potential connections in a network is proportional to the square of the number of participants–becomes apparent: most people have nothing to say to each other! By 2005 or so, it will become clear that the Internet’s impact on the economy has been no greater than the fax machine’s.”

Here’s more reactions to Krugman’s earlier claim that someone hacked his computer and downloaded child pornography: