Each side had a man dismissed in that last encounter, while Diouf, Brown and Celtic manager Neil Lennon engaged in a bit of tit-for-tat mud-slinging in the days that followed.
Tehran said Wednesday it was temporarily recalling its ambassador from London, another move in escalating tit-for-tat gestures between the governments.
If trade policies are deemed to hurt a tradig partner, a trade war can erupt, in which countries ratchet up protectionist policies in a tit-for-tat manner, ultimately leading to economic slowdown.
The Russian deputy foreign minister on Tuesday vowed a "targeted and appropriate" response to Britain's decision to expel four Russian diplomats in a tit-for-tat battle over the murder investigation of former KGB officer Alexander Litvinenko.
It was the latest in a string of tit-for-tat murders over the past few months that have placed strain on a ceasefire deal signed in 2002.
But today polarisation is almost instant, thanks in part to the growing role of non-negotiable issues such as abortion in American politics, in part to the rise of a media industry based on outrage, and in part to a cycle of tit-for-tat demonisation.
When the plague reappeared in Britain and on the continent in the 1660s, European countries used tit-for-tat quarantines to keep out competitors, skim fees from merchants, reassure trading partners and punish those who quarantined them.
In the 1930s, the Smoot-Hawley tariff provoked tit-for-tat responses and a collapse of world trade.
Courts in 10 countries have been asked to adjudicate an apparently tit-for-tat series of intellectual property claims.
But Pakistan's refusal to play appears to be a tit-for-tat response after India said they would not take part in a Test and one-day series in Pakistan in May.
Your report states that there was tit-for-tat violence, but the reality is that it was fairly quiet in the city at the time.
"Clearly some supporters feel aggrieved that a song they believe to be no more than a tit-for-tat 'wind up' of Celtic supporters should be singled out in this way and merit the attention of police, governments and anti-racism organisations, " said Bain.
In April, Sudan and South Sudan slipped close to all-out war with a series of tit-for-tat air raids and ground attacks that prompted the African Union and Security Council to push the two sides to act.
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