You know Taylor Swift and Zayn Malik's Fifty Shades Darker song "I Don't Wanna Live Forever"?

RCA Records
Of course you do. Remember, Zayn gingerly broke a lamp in the video?
RCA Records
And Taylor did one of these:
RCA Records
Great. You also probably know that because Taylor wrote it, there's gotta be some hidden detail. Well, there is.

Big Machine Records
In the chorus, she sings "until you come back home" over and over again.

RCA Records
We get it. Like how many times are you gonna sing it, Taylor?

Big Machine Records
She says it three times in the beginning of the song.

Five times in the middle...

Four more times toward the end...

And then one last time with Zayn:

Wait a second. What's that number Taylor Swift always uses??? Oh yeah, THIRTEEN.

New Line Cinema
And if you add up the number of times she says those lyrics — 3 + 5 + 4 +1 — it EQUALS THIRTEEN.
CBS
OMG.

iHeart Radio
ANOTHER DAY. ANOTHER INSTANCE OF TAYLOR SNEAKING IN THE NUMBER 13.
MTV
Well done, Taylor. Well done.
Big Machine Records