1. When Jay Z and Justin finally appear together onstage, it doesn't matter how cool and collected you were trying to be — you're ready to wild out for the next couple hours.
2. Every time Justin skips across the stage, your heart skips for joy.
3. Oh, hello.
4. You actually feel kind of jealous every time Justin's wedding ring flashes on the screen.
5. You don't feel jealous of Jay Z, though, because he's married to Beyoncé and they belong together forever and are the best couple in the world.
6. When JT whips his glorious relaxed hair back and forth, it actually makes you want to go and buy Herbal Essences shampoo right then and there.
7. Throwing up the rock makes you nostalgic for the days of The Blueprint.
8. You even break out your special Timberlake and Carter 20/20 jerseys for the photo op.
10. That falsetto.
11. "Hard Knock Life" still sounds as fresh as it did in 1998.
12. Remember when you used to scream the hook at the top of your lungs whenever it came on? You still do that.
13. Justin's fancy footwork transports you back to the days of "Bye Bye Bye." Boy's still got moves.
14. You actually think it's kind of adorable that they coordinate their outfits...
15. ...and have so much fun dancing it out.
16. When it's time for "Mirrors," it doesn't matter how high up in the nosebleed section you're sitting, the love and energy fills up the whole stadium.
17. When Jay performs "N****s in Paris" and the whole stadium raps right along with him.
18. You get chills down your spine when Justin sings Frank Sinatra's "New York, New York," and then lose your mind when Jay Z comes in for "Empire State of Mind."
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Even if you normally think that "Empire" is cheesy as hell and overplayed, there's no denying you feel the massiveness of the song when singing along with tens of thousands of fans in a stadium. No, seriously, even Bostonians were singing loud and proud during the show at Fenway Park.