Over in the Darwin's Witnesses thread I mentioned we sometimes come across ideas given in all seriousness that don't bear much scrutiny. I don't mean things where significant numbers of people hold differing views, but one's which appear entirely self generated ... somehow. And I'd like to concentrate on things adults say.

Here are three of the kind of things I mean.

a) Wind is caused by tree branches waving

b) 'North' is just another word for 'the direction I am facing'; 'South' just means 'behind me'

c) A certain pier was built on floating tanks. The question was how they got these things with gun barrels and caterpillar tracks to float.

Please add other examples that made you say 'Whaaaat???'