WATCH: Rick Astley Joined Foo Fighters Again & Apparently This is a Thing Now

In this day and age, anything can happen—even an unlikely collaboration between the Foo Fighters and Rick Astley, that guy who’s always popping up unexpectedly in your friends' YouTube videos (because you've obviously never fallen victim to the rickroll).

Anyway, “collaboration” may not be the best term to describe … whatever it is that’s happening with these two acts.

First came that time the Foos and Astley rickrolled an audience. Then Astley paid homage to the rockers with a cover of their classic jam “Everlong.”

To continue the saga, Foo Fighters brought Astley onstage, again, for an encore performance of “Never Gonna Give You Up,” and NME dug up some fan-shot footage of the cover. Scroll down to see what The O2 Audience in London witnessed last night.

Gotta say... highlight of @foofighters show last night was @rickastley KILLING IT!!! #nevergonnagiveyouup #stuckinmyhead

— matt willis (@mattjwillis) September 20, 2017

RICK ASTLEY JUST JOINED THE FOO FIGHTERS AT THE O2 ARENA pic.twitter.com/LCVt4YhHA5

— Roisin O'Connor (@Roisin_OConnor) September 19, 2017

Rick Astley has just come on stage to perform Never Gonna Give You Up with Foo Fighters. "How am I supposed to follow that?" asks Dave Grohl pic.twitter.com/z6zL6nbHSb

— Patrick Smith (@PatrickHJSmith) September 19, 2017

Who knows—with all the celebrity appearances on Concrete and Gold, maybe Astley is just working to secure his place on the next Foo album?