Burger King

The ad triggered the devices to read out information about the burgers from online encyclopaedia Wikipedia.

However, somebody edited Wikipedia to describe the Whopper as the "worst hamburger product" and another added cyanide to the list of ingredients.

The BBC understands the ad was blocked.

Google did not publicly confirm this, saying only that it had "no involvement" in the campaign.

But Burger King confirmed to the BBC that after the first iteration of the ad was blocked, it ran a tweaked version on US TV.

A promotion for the offer, which can only be redeemed on Valentine's Day, has appeared on YouTube.

The adult toys on offer include a pink frilly blindfold, a black feather tickler and a head massager.

Before you and your partner rush out for a saucy Whopper, though, the promotion is only available in Israel.

It's a campaign that seems to be aimed at people who forgot to book a candelit dinner for two.

"Kids meal? That's for kids," the advert's narrator says.

"Burger King presents the adult meal, with an adult's toy inside."