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

The Halloween special has proven popular among fans

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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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