Somerset inspired by Thomas
Somerset's Alfonso Thomas stunned Sussex with an incredible four wickets in four balls to help his side claim an emphatic six-wicket victory in LV= County Championship Division One.
Thomas (five for 40) sealed his hat-trick by dismissing James Anyon, Rory Hamilton-Brown and Ed Joyce in the last three balls of the 17th over before returning to the attack in the 19th over and making it four in four with the wicket of Matt Machan.
Somerset's Peter Trego (three for 27) also sent Chris Nash back to the pavilion in between as Sussex crashed from 33 for nought to 33 for five in 10 balls at Taunton.
Thomas attempted to become the first player to take five wickets in five balls in first-class history but, much to the disappointment of the home crowd, Sussex number seven Ben Brown was able to block the delivery.
It is the first time a Somerset player has taken four first-class wickets in a row while Surrey's Gary Butcher was the last man to achieve the feat in English cricket against Derbyshire in 2000.
Sussex never recovered thereafter, posting a meagre target of 103 which Somerset comfortably knocked off with six wickets to spare.
The visitors started the day 26 without loss and Nash and Anyon made solid starts as they looked to build a lead over their opponents.
It was not long though before Thomas' heroics began as the South African paceman bowled Anyon (18), who edged on to his own stumps and the very next ball caught Hamilton-Brown lbw for a duck.
Thomas completed his treble with the all-important wicket of Joyce, who was unable to match his first-innings century, nicking the ball into the hands of Craig Kieswetter.
Somerset were buoyant and Nash felt the full force of the hosts' enthusiasm in the next over as Trego struck his inner thigh with a fizzing delivery before luring the opener into an edge that found the hands of James Hildreth in the slips.
Thomas then returned to the attack, looking to make it four in four, and he did just that as Machan's off-stump flew into the air, leaving Sussex's hopes of victory in tatters.
Luke Wright (35) and Ben Brown (35) temporarily stemmed the tide but when Brown was caught by Alviro Petersen and Marcus Trescothick held on to dismiss Wright, Sussex looked unlikely to set a three-figure target.
Trego claimed his third wicket in the next over, as Luke Wells (two) was caught by Kieswetter before a late stand between Steffan Piolet (30) and Will Beer (29) frustrated the home side.
George Dockrell (two for 37) finished Sussex off, however, as he dismissed both Piolet and Beer to leave Sussex defending a slender lead.
Somerset seemed determined to wrap up the win before the day closed as the hosts put on 41 before Johann Myburgh fell for 27 in the fifth over to Steve Magoffin (one for 29) and Trescothick was out for 14 soon after to Anyon (two for 28).
Nick Compton (38 not out) came in and took charge, however, and while Petersen (nought) and Hildreth (11) were both out before the end, Kieswetter (15 not out) was able to hit the winning runs and seal a memorable victory.