Arsenal fans fumed when Bruno Guimaraes signed for Newcastle in January after being linked with the north London club.
Guimaraes had been a long-time target for Arsenal, but Eddie Howe pulled off a major coup by signing the Brazilian for £33m while Mikel Arteta and Co dragged their heels.
The midfielder did his best to rub salt in the wounds, posting a video on social media that appeared to mock their interest by showing newspaper cuttings linking him with Arsenal, before cutting to a montage of Newcastle's history and himself posing in the club's shirt.