Last night, Jimmy Fallon interviewed superstars BTS on a New York City train. Moments before BTS boarded, though, Run-DMC's Rev Run was in the carriage performing a freestyle with The Roots and by the looks of things, that almost-connection has caused Twitter's collective mind to melt.

Why you ask? Apparently, BTS danced to Run-DMC's "It's Tricky" years ago, so now fans think this Fallon episode was a full-circle moment. Shortly after the interview, BTS performed their hit song "ON" inside of an empty Grand Central station.

Fans on Twitter are calling the whole episode a "glow up," while others just wish BTS would have danced to "It's Tricky" in front of Rev Run. All in all, it's a good time to be a BTS stan, as the supergroup will also be appearing on James Corden's Carpool Karaoke tomorrow night.

Check out Run and BTS' performances on Jimmy Fallon below, then keep scrolling for some of the best reactions.

Rev Run *and* BTS?!

BTS have been winning lately

Some people were more shocked by Rev Run's cameo

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