The Maid and the Palmer (Roud 2335, Child ballad 21)

Not quite the particular flavor of weirdness I dig the most, but definitely an interesting one:

"A palmer (pilgrim) begs a cup from a maid who is washing at the well, so that he could drink from. She says she has none. He says that she would have, if her lover came. She swears she has never had a lover. He says that she has borne six babies and tells her where she buried the bodies. She begs some penance from him. He tells her that she will be transformed into a stepping-stone for seven years, a bell-clapper for seven, and spend seven years in hell.

In some variants, the children were incestously conceived."

Here's the Martin Carthy version:

Oh, the maid went down to the well for to wash,
And the dew fell down from her snow-white flesh,
The dew fell down from her snow-white flesh
As the sun shone down so early.

And as she washed, as she wrang,
She hung them out on a hazel wand,
She hung them out on a hazel wand
When by there come a palmer man.

Oh, God speed you, Old Man, she cries,
God speed you, you fair pretty maid,
God speed you, my pretty fair maid
As the sun shines down so early.

Have you got a cup? Have you got a can?
Can you give a drink to a palmer man?
Can you give a drink to a palmer man
As the sun shines down so early?

Oh, I've no cup and I've no can
And I cannot give a drink to a palmer man,
I cannot give a drink to a palmer man
As the sun shines down so early.

You lie, you lie, you are forsworn,
For if your true love came from Rome,
Then a cup, a can you'd find for him,
As the sun shines down so early.

Now she swore by God and the good St. John,
A true lover she'd had never the one,
A true love she'd had never the one,
As the sun shines down so early.

You lie, you lie, you are forsworn,
For nine children you have born,
Nine children you have born
As the sun shines down so early.

Oh, there's three of them lying under your bedhead,
Three of them under the hearth are laid,
Three of them under the hearth are laid
As the sun shines down so early.

Three more laying on yonder green,
Count, fair maid, for that makes nine,
Count, fair maid, for that makes nine
As the sun shines down so early.

Palmer, oh palmer, do tell me,
Penance that you will give to me,
Penance that you will give to me
As the sun shines down so early.

Penance I will give thee none,
But seven years as a stepping stone,
Seven years as a stepping stone
As the sun shines down so early.

Seven more as a clapper to ring in the bell,
Seven to run as an ape through hell,
Seven to run as an ape through hell
As the sun shines down so early.

Welcome, welcome stepping stone,
Welcome clapper in the bell to ring,
Welcome clapper in the bell to ring
As the sun shines down so early.

Welcome stone, welcome bell,
Christ, keep me from the apes of hell,
Christ, keep me from the apes of hell,
As the sun shines down so early.