There was a time when my friends and I would recite this incantation from the movie Excalibur at the slightest provocation (in my own phonetics):

Anhaal nathrak Uth vos bethod Dothial tienvay!

I've come to find that this line was constructed from Old Irish:

In Old Irish:

Anál nathrach, orth’ bháis’s bethad, do chél dénmha

In Modern Irish:

Anáil nathrach, ortha bháis is beatha, do chéal déanaimh

In English:

Serpent's breath, charm of death and life, thy omen of making.

from http://www.evertype.com/misc/charm.html