Nando's diner Ade Franco spotted a staff member filling up Heinz ketchup bottles from an unbranded container earlier this week, and he thought he smelt a rat.
"So nandos (sic) out here deceiving people it was never really Heinz," Franco tweeted along with a video of Nando's staff going about their sauce duties.
Had they been caught red-handed fobbing off customers with non-branded ketchup in Heinz bottles?
The tweet quickly went viral as people were shocked by what they saw.
Important questions were raised...
An explanation was demanded...
And an explanation is exactly what a spokesperson for Nando's gave us: "Our ketchup is 100% Heinz," they told BuzzFeed News.
"We only ever use Heinz in our restaurants," they added.
The woman on film was simply using a squeezy bottle for ease of ketchup decantation into the classic glass bottles.
As indeed, some wilier tweeters had suspected.
So there you go. Mystery solved.
Happy dipping, chicken lovers.