Nasir is a millennial who works as a software engineer. On Twitter, he describes himself as a “proud Muslim,” and he’s been involved with an interfaith group that helps refugees from war-ravaged Syria settle in Canada.

Did Nasir have a conversion experience this year that led him to support Trump?

Far from it.

Here’s how his ill-fated Trump donation came to be: One of Nasir’s friends wanted to exercise more, so they made a bet. For each day the friend skipped a workout, he’d be required to donate to an “anti-charity,” which, in this case, was Trump.

When the moment of truth came in April, Nasir’s friend had missed enough days to owe 300 Canadian dollars. At the time, the friends calculated that amount equaled $225.

A few keystrokes later, though, Nasir was the one joining the ranks of thousands of Americans who have donated to Trump’s campaign. That’s because his friend used Nasir’s credit card to make the online donation — with the intent of paying Nasir back.

“I wanted him to feel the pain of having lost his bet,” Nasir told the Center for Public Integrity. “The donation that you discovered was made with the intent of helping my friend learn a powerful life lesson. Not with the intent of any kind of publicity or actually supporting Trump.”

The friends documented the learning experience in a video that was, until recently, posted publicly on YouTube. (It’s now private.)

During one moment of levity in the video, Nasir’s friend points to his right bicep and says: “The lack of guns here is a testament to how great your wall is going to be.”

To be safe, political campaigns should pay extra attention to contributions received from people living outside the United States, said Ken Gross, who heads the political law practice at the firm Skadden, Arps, Slate, Meagher & Flom in Washington, D.C.

“Typically, a campaign or PAC will take steps to affirm that the donor is a U.S. citizen or green card holder,” Gross said.

Neither Hicks, Trump’s spokeswoman, nor Don McGahn, Trump’s campaign lawyer and a former chairman of the Federal Election Commission, responded to questions about how the campaign vets contributions from foreign addresses.

Paul S. Ryan, deputy executive director of the Campaign Legal Center, a nonprofit campaign finance reform advocacy group, said that while this “light-hearted fun between buddies” was not “particularly troubling,” it was still a violation of the law prohibiting contributions from foreign nationals.

“You cannot undo a violation of federal law by getting a refund or seeking a refund of your contribution once you’re caught,” Ryan continued. “The question is whether it’s a significant enough violation that the FEC would care.”

FEC spokeswoman Judy Ingram declined to comment on the specifics of this case.

The agency typically sends letters to campaigns asking for additional information when it notices contributions that appear to be impermissible.

The FEC did just that in August, flagging Trump campaign contributions from three individuals with foreign addresses. But Nasir was not among them.