Ruthless Wasps thrashed holders Toulon 32-6 at Ricoh Arena on Sunday to make it two European Rugby Champions Cup wins out of two.
Wasps consigned Leinster to their heaviest home defeat in Europe last weekend and followed up that 33-6 hammering by securing a bonus-point victory against the Top 14 giants which was a huge statement of their intent.
Toulon have won this tournament three years in row, but started their quest to claim yet another title by suffering only their fourth defeat in 28 games in this competition.
Nathan Hughes and Ruaridh Jackson scored well worked tries in the first 10 minutes to stun Toulon, whose European campaign started a week later than scheduled due to the terrorist attacks in Paris last Friday.
Elliot Daly also booted a brilliant long-range penalty, with Jonathan Pelisse scoring the visitors' only points from the tee as they trailed 20-6 at half-time.
The Premiership side must have been braced for a second-half fightback from a star-studded Toulon side, but the visitors remained second best and Frank Halai raced away for Wasps' third try - which Jackson converted impressively to take his tally to 14 points.
Hughes then put the icing on the cake by forcing his way over for the bonus point try as Wasps gained revenge for their defeat to Toulon in the quarter-finals last season.
David Strettle scored two tries as Clermont Auvergne started their European campaign with a 34-29 bonus-point victory over Ospreys in a Pool Two thriller at fortress Stade Marcel-Michelin.
The Top 14 leaders looked set for an emphatic victory when they raced into a 20-3 lead at half-time, but Ospreys salvaged two bonus points by running in four second-half tries - two of which came with time running out in a dramatic finale.
Wing Strettle conjured up a brilliant individual try in the first half and also crossed in the second, with Aurelien Rougerie and Wesley Fofana also scoring for this year's beaten finalists.
Justin Tipuric and Eli Walker got Ospreys back in at 20-17, then Sam Parry and Tom Habberfield crossed in the closing stages to secure what secure a snatch a bonus point as Clermont stretched their unbeaten home run in Europe to 24 games.