The 33rd First Annual Ig Nobel Prize ceremony took place on Thursday, 14 September 2023, and was presented in webcast.[307]
- Chemistry and Geology: Jan Zalasiewicz, for explaining why many scientists like to lick rocks.[308]
- Literature: Chris Moulin, Nicole Bell, Merita Turunen, Arina Baharin, and Akira O'Connor, for studying the sensations people feel "when they repeat a single word many, many, many, many, many, many, many times."[309]
- Nutrition: Homei Miyashita and Hiromi Nakamura, for experiments to determine how electrified chopsticks and drinking straws can change the taste of food.[310][311][312]
- Medicine: Christine Pham, Bobak Hedayati, Kiana Hashemi, Ella Csuka, Tiana Mamaghani, Margit Juhasz, Jamie Wikenheiser, and Natasha Mesinkovska, for using cadavers to explore whether there is an equal number of hairs in each of a person's two nostrils.[313]
- Mechanical Engineering: Te Faye Yap, Zhen Liu, Anoop Rajappan, Trevor Shimokusu, and Daniel Preston, for re-animating dead spiders to use as mechanical gripping tools.[314]
- Public Health: Seung-min Park, for inventing the Stanford Toilet, a device that uses a variety of technologies such as dipstick test strip for urine, a computer vision system for defecation analysis, an anal-print sensor paired with an identification camera, and a telecommunications link that can analyze the substances that humans excrete.[315][316][317][318]
- Physics: Bieito Fernández Castro, Marian Pe?a, Enrique Nogueira, Miguel Gilcoto, Esperanza Broullón, Antonio Comesa?a, Damien Bouffard, Alberto C. Naveira Garabato, and Beatriz Mouri?o-Carballido, for measuring the extent to which ocean-water mixing is affected by the sexual activity of anchovy fishes.[319]
- Education: Katy Tam, Cyanea Poon, Victoria Hui, Wijnand van Tilburg, Christy Wong, Vivian Kwong, Gigi Yuen, and Christian Chan, for carefully studying the boredom of teachers and students.[320]
- Communication: María José Torres-Prioris, Diana López-Barroso, Estela Càmara, Sol Fittipaldi, Lucas Sede?o, Agustín Ibá?ez, Marcelo Berthier, and Adolfo García, for studying the mental activities of people who are expert at speaking backward.[321]
- Psychology: Stanley Milgram, Leonard Bickman, and Lawrence Berkowitz for experiments on a city street to see how many passersby stop to look upward when they see strangers looking upward.[322]