re: For instance the OWT that eating dandelion leaves causes incontinence in children

it that is an OWT, its also has an element of truth. chemicals in the plants, (similar ones are found in aspargas) do have a dieretic effect!

OTC 'diet aides' use plant extracts from both dandelions and asparagas to stimulate weight loss, (they do!, and slightly dehydrate you as well at the same time.)

many OWT's are superstitious, but many have elements of truth. OWT are sets of general rules --that were often dismissed by science.. but many of them have been 'proven' true (even if only partially true) over the years.

dandelions were called 'piss in beds', too, a name the rightfully earned!