Celebrity armpit cheese? Screaming chickens? Roomba’s? We don’t ‘need them’ - so why do we buy them?

Do you smeeeeeeeeeeeeeeel, what The Rock is cooking? That’s cheese made from celebrities armpits, toes and ears. Strange but thankfully it’s only for an art exhibition. However, how often have you bought something strange in the past that puts a smile on your face? Behind every weird purchase you’ve made, there's a science to it.