One couple to rule them all.
Sméagol and Déagol
Almost all we know about this relationship is that one killed the other to get the ring. Based on that information, I'd say it was pretty dysfunctional.
New Line Cinema
Wormtongue and Saruman
It didn't end well but they achieved some pretty evil stuff together while it lasted.
New Line Cinema / Via tumblr.com
Newline Cinema / kittykate90.tumblr.com
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Ranking The (B)romances In "The Lord Of The Ring" From Worst To Best