Seriously review – headstands, bananas and a dog watching porn reveal photography’s silly side

Sprüth Magers, London From a girl chewing gum to a colourless cheeseburger, you can’t help but smile as artists including Cindy Sherman and Sarah Lucas make political points with bizarre humour An exhibition of conceptual photography that has a sense of humour? Seriously? Sprüth Mager’s new (…)