2012
- Psychology: Anita Eerland, Rolf Zwaan, and Tulio Guadalupe for their study "Leaning to the Left Makes the Eiffel Tower Seem Smaller".
- Peace: The SKN Company, for converting old Russian ammunition into new diamonds.
- Acoustics: Kazutaka Kurihara and Koji Tsukada for creating the SpeechJammer — a machine that disrupts a person's speech, by making them hear their own spoken words at a very slight delay.
- Neuroscience: Craig Bennett, Abigail Baird, Michael Miller, and George Wolford, for demonstrating that brain researchers, by using complicated instruments and simple statistics, can see meaningful brain activity anywhere — even in a dead salmon.
- Chemistry: Johan Pettersson, for solving the puzzle of why, in certain houses in the town of Anderslöv, Sweden, people's hair turned green.
- Literature: The US Government General Accountability Office, for issuing a report about reports about reports that recommends the preparation of a report about the report about reports about reports.
- Physics: Joseph Keller, Raymond Goldstein, Patrick Warren, and Robin Ball, for calculating the balance of forces that shape and move the hair in a human ponytail.
- Fluid dynamics: Rouslan Krechetnikov and Hans Mayer for studying the dynamics of liquid-sloshing, to learn what happens when a person walks while carrying a cup of coffee.
- Anatomy: Frans de Waal and Jennifer Pokorny, for discovering that chimpanzees can identify other chimpanzees individually from seeing photographs of their hips.
- Medicine: Emmanuel Ben-Soussan and Michel Antonietti, for advising doctors who perform colonoscopies how to minimize the chance that their patients will explode.
Read more about this topic: List Of Ig Nobel Prize Winners