Ireland eventually cruised past Romania by 44-10 in front of a record crowd for a Rugby World Cup match at Wembley Stadium on Sunday.
It took the Six Nations champions over 60 minutes to notch up their bonus point try before they ran riot late on, watched by 89,267 fans of which well over half were present wearing green.
Ireland wingers Keith Earls and Tommy Bowe both scored either side of half-time and the Pool D favourites never looked out of control at any moment, even if it took longer than planned to ensure they took away maximum points – a compliment to Romania who were dogged and snuffed out a number of Irish attacks without troubling the scoreboard themselves until a late consolation try from Ovidiu Tonita.
The only real negative for Ireland was the withdrawal of Rob Kearney after he came on in the second half as a replacement, although he left the field unassisted.
Chris Henry and Simon Zebo were both noticeable standouts for Ireland, who ultimately finished with six tries.
Everybody but referee Craig Joubert thought Zebo has produced the try of the tournament after a brilliant score in the corner following some of his trademark footballing skill, but a look from the TMO confirmed that his foot had been in touch.
Ireland would have to wait a little longer, not too long though, as Tommy Bowe ended his seven-game try drought with an inch-perfect finish by the corner flag after Ireland exploited an overlap.
Madigan's second penalty made it 13-3 as the Six Nations champions flexed their muscles, finding complete control at the lineout.
Zebo had provided the final pass for Bowe's try and was once more the provider when Ireland struck again, floating out a perfect pass to his Munster team-mate Keith Earls who dipped his head and sprinted for the line.
It took 33 minutes until the game's first scrum, normally Romania's stronghold, but they were well pressured by Ireland who completely dominated possession (71 per cent) and territory (76 per cent) throughout the first half.
Yet their lead was only 15 points going into the break up 18-3 thanks to those tries from their two wingers.
It took all of three minutes into the second half for Earls to strike again. Eoin Reddan's low rolling kick bounced up perfectly for Earls to rush behind the Romania defence and dot down, with Madigan landing the wide conversion. In the process Earls levelled Brian O'Driscoll's record of seven Rugby World Cup tries for Ireland.
Credit to Romania, their heads never dropped. Adrian Apostol's break down the touchline sparked a long attack in Irish territory, only for Richardt Strauss to strike at the breakdown with a turnover.
Earls was denied the chance of a hat-trick after going off for a Head Injury Assessment.
Wembley's mexican wave produced such volume that Romania had to form a huddle in order to call their lineout, but they continued to frustrate with key turnovers deep in their own 22.
They were close to going down to 14 men after Florin Ionita's dangerous tackle in the air on Paddy Jackson, only resulting in a penalty, but it set up Ireland in the Romanian 22 and ultimately led to their bonus point try.
Reddan's loop with Jackson created the space out wide for Bowe to grab his second try, shortly followed over by replacement Rob Kearney after another Zebo break created by Ireland's clever runners in their backline.
Ireland's sixth try was all about forward power as Henry came up with the ball after an unstoppable rolling maul.
Veteran lock Tonita came up with a deserved score for Romania after their defensive work and kept Ireland from scoring a seventh try into overtime, but the job was long done for Ireland as they take ten points from their first two games.
Man of the Match: A close call as Ireland's back three all shone but Simon Zebo was all class for Ireland, providing two assists and close to pulling off a spectacular score of his own.
Moment of the Match: Not actually during the 80 minutes but afterwards following Romania's lap of the pitch to warm applause from the crowd, scrum-half Florin Surugiu proposed to his girlfriend out on the field, who said yes!
Villain of the Match: Nothing nasty to report.
Tries: Bowe 2, Earls 2, Kearney, Henry
Cons: Madigan 4
Pens: Madigan 2
Yellow Card: Gal
Ireland: 15 Simon Zebo, 14 Tommy Bowe, 13 Jared Payne, 12 Darren Cave, 11 Keith Earls, 10 Ian Madigan, 9 Eoin Reddan, 8 Jamie Heaslip, 7 Chris Henry, 6 Jordi Murphy, 5 Devin Toner, 4 Donnacha Ryan, 3 Nathan White, 2 Richardt Strauss, 1 Cian Healy.
Replacements: 16 Sean Cronin, 17 Jack McGrath, 18 Tadhg Furlong, 19 Paul O'Connell, 20 Sean O'Brien, 21 Conor Murray, 22 Paddy Jackson, 23 Rob Kearney
Romania: 15 Catalin Fercu, 14 Adrian Apostol, 13 Paula Kinikinilau, 12 Csaba Gal, 11 Ionut Botezatu , 10 Michael Wiringi, 9 Valentin Calafeteanu, 8 Daniel Carpo, 7 Mihai Macovei (c), 6 Valentin Ursache, 5 Ovidiu Tonita, 4 Valentin Poparlan, 3 Paulica Ion, 2 Andrei Radoi, 1 Andrei Ursache
Replacements: 16 Mihaita Lazar, 17 Otar Turashvili, 18 Alexandru Tarus, 19 Johan Van Heerden, 20 Stelian Burcea, 21 Florin Surugiu, 22 Florin Ionita, 23 Florin Vlaicu
Referee: Craig Joubert (South Africa)
Assistant Referees: Leighton Hodges (Wales),Romain Poite (France)
TMO: Shaun Veldsman (South Africa)