Robert Southey's The Well of St Keyne (tune Helston Floral Dance) tells how the first one of a married couple to drink from the magical well will permanently gain the upper hand in the marriage.

The man telling this to the stranger regrets that though he dashed to the well on his wedding day, he was outwitted by his bride, who took a bottle into church. I reckon he had lost before the banns were published.

I will try and dig up the lyrics.