Antiquarium came from the clouds to mug Seamour close home and win a thrilling renewal of the John Smith's Northumberland Plate at Newcastle.
Seamour looked set to give local trainer Brian Ellison a cherished victory in the prestigious heritage handicap - run on Tapeta for the first time - when setting sail for home in the hands of Ben Curtis well over a furlong out.
Antiquarium (16-1) had plenty to do as Seamour built up a big lead, but the Charlie Appleby-trained four-year-old found an extra gear for James McDonald to burst out of the pack and nail the leader 50 yards from the line.
Seamour (13-2 favourite) had to settle for second place, beaten a length and a quarter, with Nearly Caught (16-1) taking third spot for the second year running, two and a quarter lengths away. Moscato (14-1) was fourth.
New Zealander McDonald said: "I'm thrilled to ride in a big race for Godolphin and Sheikh Mohammed, it's a big team effort and I'm the lucky recipient to be on top.
"Maybe there's a good one in mind in early November (Melbourne Cup). I'm sure he will, he showed a really good turn of foot which we like Down Under.
"He had a turn of foot like a miler and has plenty of pace.
"Hopefully he goes the right way."
James Ferguson, assistant trainer, said: "James gave him a wonderful ride, he didn't panic when he was a long way back and obviously knew what he was sat on.
"He'd been on the all-weather before, never over that trip but he saw it out really well.
"We're really chuffed, it's a huge team effort at home.
"We'll see what the handicapper does but there's a £100,000 open handicap at Goodwood that looks the next logical step."
Ellison said of the runner-up: "He probably went too early, but he had so much horse underneath him. He was going too well.
"It does show we have a really good horse on our hands. He'll go for either the Ebor or the Lonsdale (at York in August). That's where he'll go next.
"I've always thought he was a Group horse and he's grown up since last year.
"We had him right on the day."