There's no lack of talent in Mel's category and she's got a clear idea of who she wants in the next round.
One hopeful is branded "boring" by Mel while she stops another ridiculous performance after just seconds.
She says: "I can't take this, let's stop that."
And while other judges let acts down softly, Mel snaps: "I can't give you seat, that's really simple for me, I can not give you a seat."
When they ask for a chance, Mel replies: "No, get off.
"Get off, get off, get off!"
Backstage, X Factor host Dermot O'Leary remarks: "Mel has been so tough, she's not given those seats away easily."
He adds: "Absolutely brutal, no deliberation, just get off the stage. She's a tough judge."
The X Factor 2014 airs tonight at 8PM on ITV.
Browse pictures of this evening's bootcamp acts below...