The move backfired in spectacular fashion as Harris was sent off just two minutes into the second-half after an off-the-ball clash with Aron Gunnarsson.
Albert Watson headed in from a Philip Carson free-kick on 36 minutes but O'Neill was sent-off for an off-the-ball clash with Eamon Doherty after 42.
Federico Pucciariello and Matt McCullough were yellow-carded after an off-the-ball clash and Kieron Dawson was sin-binned minutes later as Ulster were reduced to 13 men.
The game was always close to boiling over, and Lukas Podolski went down after an off-the-ball clash with Rene Aufhauser, then went eyeball to eyeball with Emanuel Pogatetz.
Brown's 66th-minute dismissal for an off-the-ball clash with Rangers' Kyle Lafferty was the main flashpoint in an absorbing contest that featured an injury-time winner by the Ibrox side's Maurice Edu.
Portugal, semi-finalists in Germany four years ago, had Ricardo Costa sent off for an off-the-ball clash with Joan Capdevila before the end but by then their fate already looked sealed.
There was more drama for the bumper 1, 425 crowd to witness when Bath midfielder Mark Badman and Chelmsford's Ricky Modeste were both dismissed following an off-the-ball clash nine minutes from time.
Both Zidane and Marco Materazzi found the net in the 2006 final in Germany between France and Italy, but it was the pair's off-the-ball clash deep into extra time that became the tournament's defining moment.
"What has often been indicated in these studies is that people who head a lot compete to head the ball, and in those circumstances they may clash heads and get elbows to the head, which can cause concussion, " he told CNN.
The clash was sparked by bowler Benn colliding with non-striker Johnson while trying to field a ball.
Healy has developed into a fine scrummager as well as a powerful ball carrier, but admits he will have a nervous few days in the build-up to Saturday's clash.
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