One can only scratch the surface when it comes to the successes of Blackout.

Britney Jean Spears led the charge in 2007 as the record's executive producer, and years later, Blackout was raved as possibly the most influential pop record within a five-year period, after which it was inducted into the Rock and Roll Hall of Fame Library.

But much of what fueled the interest in the 2007 music project was the gossip.

Speculation will always surround the abandoned "Gimme More" video concept, the alleged basket of J.R. Rotem tracks that nearly made it to the record and the he-said-she-said talks of a Blackout tour.

But while there's a lot of lost info out there, plenty has surfaced. So, celebrate this year's Blackout anniversary with the record's lesser-known facts and mysteries.

"It's Britney, bitch" was an unplanned lyric intro on "Gimme More"

The iconic phrase began as a joke that producer Danja told Britney to say while recording the track -- but little did they expect the lyric to become a staple of the pop star's career from that moment forward. At the very least, it was intended as slight attention grabber to help propel Britney's return after her absence from the music scene.

The original intros to "Break The Ice"" and "Outta This World" included extra dialogue, but didn't make the cut

Britney can be heard whispering an additional spoken line ("Can you take this?") in certain versions of "Break the Ice," such as the Wideboys Mix, which suggests the line was removed from the original mix of the track at some point.

"Outta This World" (originally titled "A Song About You") had a spoken intro by none other than the song's writer herself, Keri Hilson.

"Hot As Ice" was officially titled "Cold As Fire," but after an early leak, the title was swapped

Blackout was plagued with relentless internet leaks, and this was one of many attempts that were made to salvage the unfortunate spread of unreleased material.

Because of the drastic difference in vocal styling between the two versions, fans have some strong opinions about which version holds more character to Britney's artistry.

"Everybody" began as a Cheetah-licious demo, intended for Rihanna

You heard correctly. That is, indeed, The Cheetah Girls singing the demo to this Blackout track. The lyrical changes that occurred later are said to be ones made by Britney herself, but she remains uncredited on the track.

The song was originally intended for Rihanna's sophomore record, but after producer/writer J.R. Rotem began collaborating with Britney, he pitched the electro-pop jam for Blackout instead. Perhaps Rotem thought "SOS" was enough '80s sampling for one Rih Rih record.

Robyn sings the background vocals to "Piece Of Me"

After recording the hit song's demo, the Swedish pop singer's vocals were kept for the official track as backup.

There are also claims that the demo lyrics varied from the album version. The official Japanese lyric booklet made the mistake of printing the demo lyrics to certain tracks (as seen by the section with Keri Hilson's spoken intro to "Outta This World"), and the last line of "Piece of Me" reads: "And when the pieces fit together it will finally become complete -- the real me."

The booklet is also riddled with typos, however, so this may just be another general error.

The "Freakshow" instrumental demo appeared on production duo Bloodshy and Avant's website a year before the record's release

Context is everything, however, and at the time, there was no indication that the instrumental would land on the pop bible a year later.

Speaking of the pop bible and Bloodshy & Avant, pray to Godney that the duo are included in her upcoming project. Another era without either of the two producers would be difficult to endure for Brit's fans.

"Toy Soldier," "Get Back" and "Hot As Ice" were all rumored to be the Blackout lead single

While promoting his Epiphany record, T-Pain was frequently asked about his confirmed studio work on Britney's upcoming album, and apparently during a "TRL" interview that year, the “Hot As Ice” writer referenced that his track was being considered as a lead single.

During the album’s pre-production period, alleged social media posts from writers Sean Garrett and Corte Ellis also referenced that their tracks were being considered as well, indicating that "Toy Soldier" and "Get Back" were potential lead singles.

"Radar" was originally the final single released from Blackout

Promotion for the fourth single was cancelled at the last minute in hopes of wrapping up the Blackout era early, but not before some of the physical "Radar" promotional CDs made their way onto the market, sold as a rare collector's item online.