
This LINK is made of Valyrian steel.
Game of Thrones Season 2, Episode 3

There must be some causal LINK
I'm missing.
The Big Bang Theory Season 1, Episode 12
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"Aníbal Cortés is
the weakest LINK in the chain.
Money Heist Season 1, Episode 10

She went after you
because you're the weak LINK.
Money Heist Season 3, Episode 5

And it will be then, when they’ll try
to aim for the weakest LINK.
Money Heist Season 1, Episode 11