Going to a cannabis factory with your mum doesn't sound like a fun day out. But it's the sort of mischief Russell and Ninette Howard get up to as they return to the States for another run of their US road trip.The first port of call is Portland, Oregon, where recreational use of cannabis has recently been made legal. The duo embark on buying it, smoking it and even eating it - with mildly amusing consequences.Russell seems eternally perplexed by and slightly exasperated with his dear mum, who frequently upstages her son with scene-stealing one-liners. When it comes to trying the drug, for example, she has one key question: "Will it make my bunions stop hurting?"

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Documentary