We're loving this though – one amazing fan on Twitter (@sassyfthoran) has already dreamed up a teaser video for the guys' return, called the Aftermath Tour. Clever, actually.
She tweeted the clip, writing: "IMAGINE THE BOYS HAVING AN AFTERMATH TOUR AND THIS IS THEIR INTRO SONG GOODBYE"
Okay, it's all amazing and brilliant...and we're pretty sure the fandom will continue to pepper our Twitter feeds with crafty little creations just like this.
Keep 'em coming, guys...18 months is a loooonnng time.