Glasgow stunned Magners League title chasing Ulster with a 10-24 win at Ravenhill on Friday.
Tries from Rory Lamont, John Barclay and John Beattie, who ran in a 75-metre interception try, were enough to give Sean Lineen's side a thoroughly deserved win.
It was a largely forgettable first half with tone for the home side's performance set by Paddy Wallace's penalty miss after two minutes.
Nearly all the constructive rugby came from the Warriors and only a great pick up and drive from his own line from 100th cap-winner Roger Wilson prevented the visitors from opening their account early in proceedings.
There was little of interest until just before the 20th minute when a Wallace inside pass put Tommy Bowe into space and the Ireland international found Andrew Trimble, whose pass failed to put Andy Maxwell in the clear for a great scoring chance.
But Ulster's urgency did not last and four minutes before the half-hour they threw a long line out ball to Stephen Ferris, who got wrapped up and conceded a penalty. Dan Parks made no mistake and the Warriors had the lead.
The score saw Glasgow, whose ball-carrying and tackling constantly had Ulster on the back foot, up the tempo and they should have scored a try on 34 minutes when Andrew Henderson made a clean break.
However Henderson chose to go it alone and a great Bowe tackle saved a certain score.
But the Warriors did not squander their next chance and, deep in injury time, Rory Lamont dashed over after the forwards had done some great approach work. Parks converted and Glasgow led 10-0.
Ulster came out in the second half intent on making an impact but Bryn Cunningham dropped a scoring pass in the opening exchanges.
Still, Trimble did cross the line after 50 minutes following a great break from Wallace and scoring pass courtesy of Wilson.
However, Wallace missed the conversion and was promptly hauled off for David Humphreys who, shortly after coming on, tried an inside pass that was snapped up for Beattie's long-range score.
Parks added the points and then, eight minutes after the hour, Glasgow destroyed an Ulster scrum on the home side's line with Barclay getting the touchdown.
Parks again added a conversion, from a tight angle, and Ulster's hopes were extinguished, Andy Maxwell's 79th-minute try being of little consolation.
Tries: Trimble, Maxwell
Tries: Lamont, Beattie, Tkachuk
Cons: Parks 3
Ulster: 15 Bryn Cunningham, 14 Tommy Bowe, 13 Andrew Trimble, 12 Paul Steinmetz, 11 Andrew Maxwell, 10 Paddy Wallace, 9 Isaac Boss, 8 Roger Wilson, 7 Neil Best, 6 Stephen Ferris, 5 Ryan Caldwell, 4 Justin Harrison, 3 Simon Best, 2 Rory Best, 1 Bryan Young
Replacements: 16 Paul Shields, 17 Justin Fitzpatrick, 18 Tim Barker, 19 Neil McMillan, 20 Kieran Campbell, 21 David Humphreys, 22 Paul McKenzie
Glasgow Warriors: 15 Francisco Leonelli,14 Rory Lamont, 13 Andrew Henderson,12 Scott Barrow, 11 Thom Evans, 10 Dan Parks, 9 Graeme Beveridge, 8 John Beattie, 7 John Barclay, 6 Steve Swindall, 5 Alastair Kellock (c), 4 Andy Newman, 3 Moray Low, 2 Fergus Thomson, 1 Justin Va'a
Replacements: 16 Scott Lawson, 17 Kevin Tkachuk, 18 James Eddie, 19 Andrew Wilson, 20 Donnie Macfadyen, 21 Colin Gregor, 22 Hefin O'Hare
Referee: James Jones (Wales)
Touch judges: David Keane (Ireland), Dudley Phillips (Ireland)
Assessor: Michael Rea (Ireland)