The Norwich City midfielder took to social media after coming on as a late substitute against his former side.
So his return to the east London side in their last season at the famous ground probably didn't provide as much of a thrill, considering the Norwich midfielder came on in the 85th minute and saw his side surrender a 2-1 lead late on.
But the former West Ham man was still delighted to return to his former hunting ground and appreciated the reception from the home fans.
And the 32-year-old took to Twitter after the game to joke about a particular gesture of gratitude - a rather rude song from supporters!
Great reception yesterday for @Gazoneil when he came on from our fans & also from mark noble in the programme . Decent player— West Ham Geezer (@WHUFCGeezer) September 27, 2015
Norwich, too, are going well and - one poor set-piece aside - O'Neil's current side may well have left his old one with a 2-1 win.
Next up for West Ham is a trip to the Stadium of Light to face Sunderland, while Norwich host Leicester City.