"You are now dead" is a perfectly valid continuation of the text. The drinker might be extremely allergic to cranberries, or grapes. The cranberry juice might be poisoned.
I think it has great potential in helping authors out of creative ruts.
(Another one: Maybe they are made out of cotton candy, and they dissolve when they touch any liquid. That is the premise of one of Asimov's short stories, if my memory serves)