"Down in It" (also known as Halo 1) is a single by Nine Inch Nails, released in 1989. It was released as a teaser single prior to the group's debut album, Pretty Hate Machine.

A music video for "Down in It", filmed on location in the Warehouse District of Cleveland, Ohio by directors Eric Zimmerman and Benjamin Stokes, was released in September 1989. The original version of the video ended with the implication that Trent Reznor's character had fallen off of a building and died in the street. This footage attracted the attention of the FBI. As Reznor explains in an interview with Convulsion Magazine:

There was a scene were I was lying on the ground, appearing to be dead, in a Lodger-esque pose and we had a camera with a big weather balloon filled with helium hooked up to it... the first one we did, we started the film, I was laying on the ground and the ropes that were holding the balloon snapped, the camera just took off into the atmosphere... the camera landed two hundred miles away in a farmer's field somewhere. He finds it and takes it to the police, thinking that it's a surveillance camera for marijuana, they develop the film and think that it's some sort of snuff film of a murder, give it to the FBI and have pathologists looking at the body saying, 'yeah, he's rotting,' (I had corn starch on me, right) 'he's been decomposing for 3 weeks.' You could see the other members of the band walking away and they had these weird outfits on, and they thought it was some kind of gang slaying. (Thanks Wikipedia)