Burger King's black Halloween Whopper has an unexpected side-effect

The Halloween special has proven popular among fans

Samuel Osborne
Tuesday 06 October 2015 12:07 BST
The King unveiled the black burger last week
The King unveiled the black burger last week (PAUL J. RICHARDS/AFP/Getty Images)

People who eat Burger King's special black Halloween Whopper have reported a disturbing side-effect.

It turns your poo green.

The Halloween burger, which was launched last week, has proven popular among fans - although many newfound aficionados have voiced their concerns:

Others thought the promotional stunt might be more appropriate for St Patrick's Day:

Burger King is yet to release a statement.

Pope stops off at Burger King

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