Many sources claim that the alleged pitched blues guitar sample was actually a sample of a horse from Mel and Tim's "Good Guys Only Win in the Movies", but during an interview with "Sound on Sound" in December 2018 on the production techniques used, DJ Muggs refuted the sample:"That's weird, everybody thinks that's a horse, but it isn't. I've seen that a bunch of times on these sample sites. That's a sound I made from a blues guitar pitched. At the time I used to run some sounds through guitar amps. When I heard that horse thing, I was like, 'Oh, that sounds just like it.' Honestly to God, those sample sites get a lot wrong. They have some shit right, but I'll go, 'I never used that.' I don't where they gather their information. Sometimes, they're spot on, but sometimes, I'm like, 'Yo, you guys are off.'" However, less than two months later in an interview with British newspaper "The Guardian", Muggs then claimed the sound effect was made by a horn and not a guitar. This has since caused disbelief that Muggs is telling the truth and that the sample may well be the horse from Mel and Tim's "Good Guys Only Win in the Movies", as Muggs has claimed himself that he has "a foggy memory when it comes to the samples used on 'Insane in the Brain'" due to the fact that at the time of the song's production, "There was a lot of weed smoked."