Spectators throwing hundreds of paper aeroplanes at the stage during the 25th First Annual Ig Nobel Prize Ceremony held in Sanders Theatre at Harvard University in Cambridge, Massachusetts, on Thursday.
The Ig Nobel prizes, meant to entertain and encourage global research and innovation, are awarded by the Annals of Improbable Research as a whimsical counterpart to the Nobel prizes.
In the spirit of the event, the audience, which includes professors, researchers, students and actual Nobel laureates from around the world, is urged to come in colourful attire and to take along paper for making paper aeroplanes.
This year's winners included researchers who studied the consequences of intense kissing (medicine prize), the global use of the word "Huh?" (literature prize) and how badly bee stings hurt on different parts of the body (physiology and entomology prize).
The economics prize went to the Bangkok Metropolitan Police for offering to pay policemen extra cash if they refuse to take bribes.