As part of a very important and very scientific experiment on Thursday night's show, X Factor judge Louis was challenged to sit on a sofa with six ex-X Factor contestants.
"I think this is inspired by the six chair challenge," said Keith Lemon.
"And that's pretty scary!" replied Louis.
The former contestants were:
1. Stevi Ritchie, series 11
2. Jonathan Ansell from G4, series 1
3. Lloyd Daniels, series 6
4. Bratavio, series 13
5. 2 Shoes, series 8
6. Chico, series 2
When Bratavio were announced, Louis jokingly made this face:
He seemed genuinely excited to see Jonathan Ansell, asking if it had really been series 1 when G4 appeared. It was! They were mentored by Louis Walsh and reached the final, losing out to Steve Brookstein.
To succeed in the experiment, everyone had to sit on the sofa together and nobody's feet were allowed to touch the ground. Safe to say that was way harder than it sounds and the experiment failed.
Meanwhile, earlier in the show Louis said the previous series of X Factor was "s**t", adding: "It wasn't the show I was on. You have to have chemistry on the show and with Sharon, Simon, Nicole and me, we have great fun.
"I'm back after a year off... I was actually sacked. They just don't renew you contract!"
He also dressed like controversial rapper Honey G to earn a point for his team!
"She comes in to me and she takes off her glasses. She has a drink in my dressing room," he said.
"She's got nice eyes. That's her image and she stays in that image all the time. She's having the time of her life. Not everybody loves her but that's fine!
"Honestly she's a really nice woman
Watch Louis' transformation into Honey G below!