I can’t really think about Halloween, or Samain, if you prefer, without thinking of the ballad of “Tam Lin,” especially this part:   And ance it fell upon a day A cauld day and a snell, When we were frae the hunting come, That frae my horse I fell, The Queen o’ Fairies she caught me, In yon green hill to dwell. And pleasant is the fairy land, But, an eerie tale to tell, Ay at the end of seven years We pay a teind to hell; I am sae fair and fu o flesh, I’m feard it be mysel. But the night is Halloween, lady, The morn is Hallowday;…