Justin Bieber And Jimmy Fallon's Epic Handshake Defines Friendship Goals (Video)

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Secret handshakes are really the only way to properly express a deep, everlasting bond to your bestie.

When Justin Bieber stopped by “The Tonight Show Starring Jimmy Fallon” to perform his new single, “Sorry,” the singer ran into host Jimmy Fallon in the halls of "30 Rock," and the pair engaged in some elaborate shaking.

Spit takes, butt taps and finger fights abound in the longest handshake between two grown men since most of us can remember.

If Jimmy's handshake with the Biebs is this insane, one can only imagine the chunk of time the late-night host is forced to carve out every time he greets his friendship soulmate, Justin Timberlake.

The Tonight Show Starring Jimmy Fallon on YouTube

Citations: Justin Bieber and Jimmy Fallon Reveal Their Insanely Elaborate Secret Handshake (E! News)