From The Two Gentlemen of Verona:
This weak impress of love is as a figure
Trenched in ice, which with an hour’s heat
Dissolves to water and doth lose his form.
Shift around the letters, and it becomes:
If she is listed, his challenge is she must pour ice water over her head or vow to donate cash.
Oh man, if this fad works, it wins.
For more information, visit the ALS Association website.