Their secrets are your secrets and will be forever.

You do more reminiscing than you do "catching up".

The majority of your conversations start with "remember when..." and it's never long before one of you brings up an embarrassing childhood memory.

FX / Via gifhunters.tumblr.com

And you have a whole host of embarrassing stories to bring up at your leisure.

Flo Perry / Via buzzfeed.com

You love finding old pictures of each other and laughing over them.

Twitter: @yungranolaa

And you have photographic evidence from every stage of each other's lives, including the "awkward teen" phase.

NBC

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