The name Ghostface Killah might sound like something from a horror film, but many hip-hop fans consider him one of rap’s greatest artists. He was a founding member of the multi-platinum, Grammy Award-nominated Wu-Tang Clan — a group that, alongside Public Enemy, Biggie Smalls, N.W.A. and Tupac Shakur, helped popularize the genre in the early 90s.

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Thursday Shkreli released a two-minute, 18 second video through TMZ in which he demanded a handwritten apology from Ghostface Killah for making insulting remarks about his nose.

In a video last week, the rapper compared the millionaire’s nose to Michael Jackson’s. He also called Shkreli an unpublishable eight-letter name beginning with the letters “sh” and ending with the letter “d.”

At this point, Shkreli should be used to name-calling. His former spokesman Allan Ripp told The Washington Post: “If you could see the emails and phone calls I got, being associated with Turing — they’re vicious, hateful, in bucketfuls.” Many Twitter users are not particularly fond of Shkreli, either.

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Still, he seems to have taken the rapper’s insults to heart. In Shkreli’s video, he’s surrounded by three people wearing hoods and masks. One appears to wear a balaclava. Throughout the video, Shkreli calls Ghostface by his “government name” Dennis, rather than his rap pseudonym.

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“Most people don’t ever try to beef with me,” said Shkreli, who the BBC once called the “most hated man in America.”

The argument isn’t a complete shock, as he and the rapper have something in common: a $2 million Wu-Tang Clan album. In the video, Shkreli threatened to erase Ghostface Killah’s verses from it if he doesn’t receive an apology. The record is titled “Once Upon a Time in Shaolin,” and only one copy of it exists. In 2014, it was auctioned off to the highest bidder, the way a Degas or Picasso would be.

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“The idea that music is art has been something we advocated for years,” Wu-Tang Clan member RZA told Forbes preceding the album’s release. “And yet it doesn’t receive the same treatment as art in the sense of the value of what it is, especially nowadays when it’s been devalued and diminished to almost the point that it has to be given away for free.”

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In some ways, the album’s uniqueness was meant as commentary on the shifting record industry.

“We’re about to put out a piece of art like nobody else has done in the history of [modern] music,” said RZA. “We’re making a single-sale collector’s item. This is like somebody having the scepter of an Egyptian king.” Shkreli was the highest bidder, purchasing the album for $2 million only two months after raising the price of the drug Daraprim by 4,000 percent and one week before being arrested by the FBI.

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The whole ordeal became an Internet sensation, even sparking a hoax that claimed “the seller may legally plan and attempt to execute one (1) heist or caper to steal back Once Upon a Time in Shaolin” so long as “said heist or caper can only be undertaken by currently active members of the Wu-Tang Clan and/or actor Bill Murray.” Still, Shkreli refused to release the album to the public, though he’s allowed to, which led to Ghostface Killah’s insults. Naturally, Twitter exploded.