For Arsenal fans, Tuesday and Wednesday nights have been a difficult watch in the last three years with Spurs playing in the Champions League, while the Gunners have been consigned to the Europa League.
But every now and then, a chance for some schadenfreude comes up, and Arsenal fans were in for a treat.
Spurs took the lead against Bayern Munich in the Champions League through Son Heung-min in the first half, but were almost immediately pegged back by a stunning strike from Joshua Kimmich.
Robert Lewandowski added a second right before half-time with a great spin and finish from the edge of the box.
But in the second half, it was Gnabry's chance to shine.
The former Arsenal star broke down the left wing shortly after the break, before cutting in and feinting past Toby Alderweireld to drill a low shot exquisitely past Hugo Lloris.
And two minutes later, the Germany international was at it again.
Harry Winks was robbed of the ball close to his own area, and Gnabry was slotted in before sliding a shot past Lloris and in off the post.
And with 10 minutes remaining, the winger added the gloss to the scoreline by breaking through the centre to slot another past Lloris.
Lewandowski added another with three minutes remaining, and then Gnabry managed to grab yet another goal to make it four!
Arsenal fans wasted no time in reminding their Spurs counterparts of where the young star used to play, with some pleading him to return to the Emirates Stadium.
