X-Factor, we think, is becoming increasingly staid and predictable. So when this happened last night, we were only delighted.
During Stereokicks - that's the eight piece boyband (Eight? Really?) - and their conservative performance of Michael Jackson's You Are Not Alone, this hero right here decided to have a crack at the microphone.
The interloper was revealed as comedian Lee Nelson. Does that name sound familiar? It did to us.
He was arrested last year trying to board the plane with the England football team, so obviously public stunts like this are his bag.
Here's the live TV performance. Watch how the trained chimps / boyband members keep a straight face when he rushes the stage.
Good job all round, you guys. Let's try get one of the acts to say a curse word live on-air next week.