Guy Sebastian's controversial victory over Shannon Noll
Cast your minds back to 2003 when it all began and any Aussie will know that this was arguably one of the most divisive moments in television.
The live final at the Sydney Opera House saw three million people tune in and many felt that Shannon should have emerged victorious - even former hosts James Mathison and Osher Gunsberg (formerly Andrew G) are asked about it to this day!
Whenever Mark Holden awarded a touchdown
When it came to performances, you were either good, bad or if you were lucky, Mark Holden would deem you worth of a "touchdown."
The original judge first coined the catchphrase after Cosima De Vito's rendition of Cold Chisel's When The War Is Over and from then, it became a phenomenon and remains one of Mark's "happiest memories."
"I still get asked to do it, but there has to be a reason, I can't just do it without a reason," he told Vice in 2017.
Cosima De Vito pulling out of the competition
In a move that surprised everyone, Cosima revealed she had nodules on her throat that were affecting her performances and ended up dropping out ahead of the season one finale.
"This has been the most difficult decision of my life but the next few weeks are going to be very very intense with touring and recording and I'm not sure that I'm going to be able to give 100 per cent and that my voice is going to hold up," an emotional Cosima said at the time as she wished Guy and Shannon luck with the final.
It still brings a tear to the eye 17 years later!
The gold dress scandal
After Paulini Curuenavuli sang her powerful version of Destiny's Child hit Survivor, all judges Ian "Dicko" Dickson and Mark Holden could talk about was her gold dress.
"If I was hated last week, I'm going to be really hated this week. What's with what you're wearing girl?" Mark asked. Cue the booing crowd.
Dicko only made our blood boil when he said: "You should choose more appropriate clothes or shed some pounds."
We hope nothing like that will be said on the 2022 revamp.
Ricki-Lee Coulter leaving way before her time
Seven may be a lucky number, but for hopeful Ricki-Lee Coulter it wasn't the case when she placed seventh in the second season back in 2004.
However, she snagged a deal with a record deal along with eventual winner Casey Donovan and runner-up Anthony Callea so we suppose the Australian public can be forgiven for eliminating her far too soon.
Lee Harding's rendition of Eye of the Tiger
It was the punk rock version of a classic hit we didn't know we needed and Lee Harding granted our wishes during season three.
Lee's risky and "frantic" performance paid off though and left judges Mark Holden, Marcia Hines and Kyle Sandilands with the biggest grins on their faces and even received an iconic touchdown.
Jessica Mauboy's heart-stopping Alice Springs audition
It takes a brave singer to take on Whitney Houston but a then-16-year-old Jess Mauboy's I Have Nothing audition still gives us goosebumps.
Singing outside in Alice Springs, the judges were impressed to say the least and instantly gave her three yeses.
Damien Leith was good, but we're Team Mauboy all the way.
Matt Corby before his indie pop days
A sweet, innocent 16-year-old rocked up to audition in 2007 and little did we know that he'd end up being one of the country's biggest musical acts.
Matt Corby blew fans away with his dreamy noughties looks and unique voice but was pipped at the post by eventual winner Natalie Gauci.
His rendition of The Blower's Daughter was particularly mesmerising...chills!
Kyle Sandilands getting the boot
He's known for his controversy, but after a lie detector stunt on his 2Day FM radio show with co-host Jackie O, Kyle Sandilands was axed from the judging panel in 2009.
Ten issued a statement saying that Australian Idol "is very much a family program" and that it didn't align with Kyle's radio persona.
‘‘It has become increasingly clear that as Idol has remained a family focused show ... his radio persona has taken on a more controversial position.’’