Robert Lewandowski played party pooper to blow Arsenal's Group of Death wide open.
Borussia Dortmund striker Lewandowski's brilliant late winner ruined Arsene Wenger's 64th birthday and also leaves the Gunners sweating on their qualification again.
Arsenal, Napoli and Dortmund are all locked on six points and the feel-good factor at the Emirates suddenly went a bit flat after the Germans snatched a cruel but sweet victory.
It had Dortmund boss Jurgen Klopp, banished to the directors' box while serving a touchline ban, jumping up and down and punching in the air as he celebrated in the posh seats.
Poor old Wenger looked as if his birthday song should have been It's My Party And I'll Cry If I Want To rather than asking if the Arsenal fans still need him now he's 64.
It was rough on Arsenal but they did not hit their recent heights as Dortmund started much better and finished with a cruel knock-out blow.
Arsenal have been all singing and dancing this season, especially after Jack Wilshere's wonder goal against Norwich last Saturday.
But the truth is they never found that same rhythm and only when Santi Cazorla stepped off the bench in the second half did they look as if they could capitalise on Olivier Giroud's equaliser and go on and win the game.
They may feel a bit hard done by as Lewandowski elbowed Laurent Koscielny in the second half and could have easily been shown a red card rather than yellow.
But Dortmund were the better side overall and it is a reminder that Arsenal - and Mesut Ozil, who had probably his quietest game since his £42m move - are not always capable of miracles.