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Burger King's Halloween burger was launched last week to the cheers of burger fans.

But quickly it has become evident that the true horror of the burger is far worse than the grim black food colouring used for the bun.

People are reporting very strange happenings - and it's all about when, erm, it's been through your digestive system.

The treat may have been the whopper but the trick, it seems, is that poop is coming out bright GREEN.

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And we're not just talking a shade of dark, khaki green.

The evidence we have seen online - too crude to reveal here - really does depict a very bright, ghoulish green end product.

The eerie effect is having varying levels of reception among those who have tested the burger.

There are some that have sworn that the green by-product was too much to take...

While others - although mystified by the brightness of their poop - gave the burger a solid thumbs up.

Burger King has not yet said anything about the 'fun' side effect of the Halloween burger and Mirror Online has reached out for comment.