Most read: How Marlboro, Coke and KFC use subliminal advertising
Subliminal advertising has, historically, occupied a legal grey area, not least because it's not clear when hidden messaging might be coincidence or simply "pareidolioa" (the phenomenon of the mind perceiving a familiar pattern where none actually exists).
But the murky marketing waters are not only populated by tinfoil-hat wearing conspiracy theorists, as some cunningly crafty marketers have indeed intentionally set out to influence their audience by hidden means.
The first reported subliminal ad was from 1947, spotted on a twirling sign urging viewers to buy war bonds in a Daffy Duck cartoon.
Read on for more cunning examples of sneaky .
Marketing: Puma proclaims 'future is female' as Rihanna deal boosts sales
as brand ambassador and creative director.
Strong demand for the shoes it launched in partnership with singer Rihanna helped drive better-than-expected sales growth in the fourth quarter as sales rose a currency-adjusted 11.5% to €879m, while earnings before interest and taxation (EBIT) edged up to €10.9 million
Puma has also signed up Kylie Jenner as it focuses on women, to the consternation of brother-in-law Kanye West.
West, who has a deal with Puma arch-rival Adidas (as reported in yesterday's bulletin), claimed earlier in the year that Jenner would "never" sign up with Puma.
1000% there will never be a Kylie Puma anything. That's on my family! 1000% Kylie is on Yeezy team!!!
— KANYE WEST (@kanyewest)
More marketing news
Tech: HSBC introduces biometric security to make passwords redundant
to eliminate the need for a password or memorable security information such as place names or dates.
Instead HSBC and First Direct customers will be able to use voice recognition and touch security services to access their accounts.
Rival Barclays has already introduced voice recognition software, but has limited it to certain clients.
HSBC UK head of retail banking and wealth management Francesca McDonagh called the initiative "the largest planned rollout of voice biometric security technology in the UK".
More tech news
Social: Twitter bolsters customer service with new DM and feedback tools
as it seeks to improve its customer service offering.
The direct message tool lets brands to add a link to their tweets, allowing customers to immediately begin a conversation with a brand over direct message.
Direct messages on Twitter are being used as a tool to allow customers to share personal information with businesses over a private channel.
More digital news
Viral Chart: One million shares for OK Go's 'zero gravity' music video
The music video for the group .
The Upside Down and Inside Out video was filmed in a plane and, according to the band, was shot in zero gravity, using no wires or green screens.
Also in the news
Is there something you’d like us to share in 18:05? Email susan.billinge@haymarket.com with the details.
We’d love your feedback. Tell us what you think of the 18:05 digest, what you want to see more or less of, and if you have any content suggestions. Comment below or tweet us #1805