Nuts, nostalgia and ‘as sweet as a nut’.

Nuts feature in two types of metaphor The first is a euphemism for, ahem, testicles. Clearly perceived similarity of shape is the root or the ‘grounds’ of the metaphor. The popular Australian brand of edible nuts ‘Nobby’s Nuts’ exploits potential double-entendres to the full, particularly in an ad it used a while back: ‘Nibble Nobby’s Nuts.’