Google's fictional intelligence-boosting drink announced for April Fools in 2005 was Google Gulp.
Google presented Gulp as a “smart drink” that would improve how efficiently people used its search engine by making them more intelligent. The joke claimed that the beverage analyzed a user's DNA in real time and adjusted neurotransmitters through a supposed patented process called Auto-Drink. Its deliberately pseudo-scientific language parodied technology marketing and health claims.
The fictional product came in four absurd flavors: Glutamate Grape, Sugar-Free Radical, Beta Carotty, and Sero-Tonic Water. The names referenced glutamic acid, free radicals, beta-carotene, and serotonin. Google also built a joke around distribution: although the drink was supposedly free, customers needed to return a bottle cap to obtain one, creating an intentionally impossible invite-only system.
Google Gulp was not Google Fiber, Google Wave, or Google Buzz. Those were real Google products or services introduced at different times, whereas Gulp was an April Fools hoax and part of Google's long-running tradition of fictional launches.