Truro City turned around a 3-1 deficit to win 4-3 at Hampton and Richmond Borough in National League South.
The win - Truro's seventh of the season - moves them up to fourth place, two points off the top of the table after 12 games.
Christian Oxlade-Chamberlain crashed a 25-yard shot off the bar in the 11th minute for the Cornish side, but they wen t behind 15 minutes later when Wilson Warweru scored for the host.
Tom Dean's header 10 minutes from the break made it 1-1, but bright Siaw ensured Hampton led at the interval as he found the net three minutes from half time.
Waweru headed in his second eight minutes after the break as the hosts seemed to have sewn up all three points, but three goals in a 12-minute spell for Truro turned the game on its head.
First Tyler Harvey made it 3-2 in the 64th minute with a left-footed effort before Ben Starkie's powerful strike from outside the box levelled the scores three minutes later.
Harvey got his second with 14 minutes to go as the toe-poked home his eighth of the season as the Tinners registered a famous victory.