DFS, dwarves and urban legends

What’s your favourite urban myth? I was reminded of my favourite on Popbitch today, in a post by “onthehushhush”:

i was told today that sofa firm DFS * uses dwarves** in their adverts to make their settees look bigger than they would normally. I don’t know why I found this so shocking/funny.

Sadly it was immediately punctured by another poster, who pointed out that if DFS wanted to mislead the public it’d be a damn sight cheaper to make giant sofas for the ads than to pay the wages of people of restricted growth. So a favourite myth bites the dust.

What about you? Any favourite bits of bullshit you secretly wish were true?