Toon Humiliate Smogs
Peter Ramage, Titus Bramble, Charles N'Zogbia, Alan O'Brien and Shola Ameobi suddenly appeared on the team sheet, while Boro had former Valencia, Lazio and Barcelona midfielder Gaizka Mendieta in an otherwise inexperienced line-up.
But it was youngster Carroll, offered a four year deal this very morning, who stole the limelight.
He put the visitors ahead with a bullet header from Matty Pattison's corner. He followed it with another even better header a minute later, stooping to direct David Edgar's low cross into the net.
Stephen Thompson shot from the edge of the area to pull a goal back.
Shortly before the interval Carroll claimed his hat-trick.
David Wheater should have been sent off for bringing down Ameobi in the area but he was not even booked, then Carroll drilled in the penalty.
Ameobi had his reward shortly after the interval when Alan O'Brien sprinted down the right and produced a cross which was an invitation for the 25-year-old to tap in.
Newcastle grabbed a fifth when Alan O'Brien's cross-shot dropped to James Godsmark on the corner of the six-yard box for the substitute to convert.
Boro remain in third place, two points behind leaders Manchester City, and one behind Manchester United.
MIDDLESBROUGH: Turnbull; McMahon, Grounds, Wheater, Bennett; Franks, Walker, Mendieta, Porritt (Saiko 63); Thompson (Hillerby 72), Hutchinson. Subs (not used): Steele, Smith.
NEWCASTLE UNITED: Forster; Edgar, Ramage (Francis 50), Bramble (Bertram 72), Shanks; Pattison, Gate, N'Zogbia; Carroll, O'Brien, Ameobi (Godsmark 72). Subs (not used): Marwood, LuaLua.