Merry Walpurgisnacht!

[Dave Monroe]

http://en.wikipedia.org/wiki/Walpurgis_Night

http://en.wikipedia.org/wiki/Walpurgis_Night_in_popular_culture

May Day Eve
329; aka Walpurgisnacht

http://gravitys-rainbow.pynchonwiki.com/wiki/index.php?title=M

Walpurgisnacht
293; German: St. Walpurgia Night. The night before May 1, originally
dedicated to St. Walpurgia, the 8th century English nun who founded
religious houses in Germany. It is associated in German folklore with
the witches' Sabbat on the Brocken, where the witches and sorcerers
perform their black rites and reaffirm their subservience to the demon
Master.

http://gravitys-rainbow.pynchonwiki.com/wiki/index.php?title=W

"I've been up there every Walpurgisnacht since my first period." (GR,
Pt. III, p. 293)

Folks 'll panic the second that sunken iceberg is knocked,
Naughty 'n' noisy, and very Walpurgisnacht,
That's how the party will end,
So — welcome aboard, welcome aboard, my friend! (GR, Pt. III, p. 463)

http://books.google.com/books?id=iPDGp7VT8H8C