Sunderland fan flabbergasted after cutting into football-themed birthday cake

A Sunderland supporter was left gobsmacked when he sliced into his footie-themed birthday cake, only to discover a cheeky twist that's had social media users howling with laughter.

Alf couldn't wait to dig into his red and white birthday cake emblazoned with the logo of his belovedteam after enjoying a meal with loved ones at Milan restaurant in Northumberland. Little did he suspect, a comical shock awaited him as he made the first cut.

Footage shared on social media by shows Alf cutting through the cake, which was baked by , completely unaware of the impending joke. Women at the table can be heard instructing him to place the slice on a napkin beside him a ruse designed for him to notice what was hidden inside.

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Beneath the -themed icing, his family had sneakily filled the cake with black and white stripes the signature colours of arch-rivals Alf's reaction was priceless as someone at the table jeered: "Black and white army!"

He quickly shut down the teasing with a blunt "f**k off" before joining in the laughter himself. The 28-second video has racked up over 69,000 likes, captioned: "The moment the penny drops."

users were left in stitches at the clip too - with fans from both sides taking to the comments praising the pranksters for their banter. One user said: "Sunderland fan here. I have to admit this is class," while another dubbed it: "Absolutely class."

A third commented: "As a Newcastle United fan, I love it." Someone else penned: "Toon fan here. Hahaha I love this!! His face."