Who came up with these?

Boys will be boys - What? What else would they be? Sorely missed? Isn't that like saying 'Trees will be trees', 'Kites will be lost', 'Cats will be awkward'... ... ...And you're point is??

Nice weather for ducks - Who's asked them? And why do we believe whoever it was that did? How do we know they're not lying? Perhaps a duck actually prefers a crispy winter's morning, a fine blanket of snow on the ground and a thick covering of ice on the lake? They could be world class figure skaters for all we know.

Plane sailing - Surely it should be plane flying? Plane sailing is plane sinking, crashed plane; unless it’s a seaplane, but they never really took off. ha ha ha ha. (And I know it's spelt 'plain' before you email.)