...asked in comments on the review of Restaurant Roux. Well, dear, sweet, innocent commenter Hanoumatoi: Whippets are when you inhale the nitrous oxide from a whipped-cream canister (or a balloon filled from a tank) to experience a momentary, probably brain-cell-killing high. People who work in the restaurant industry have good access to, ahem, experiment with different uses for nitrous oxide, and Roux's fizzy grapes are injected with it, making them fizzy inside, which is momentarily very strange and pretty great when you eat them. Maybe a little bit like doing a whippet... who knows.

Everybody else...