From Ars Technica’s recap of the Ig Nobels:
Peace Prize: the US Air Force’s attempt to create a gay bomb. The Air Force takes seriously both its official policy of homosexuality being a threat to discipline and the phrase “make love, not war.” The result was a program that apparently considered (PDF) creating a discipline-busting bomb. From the document: “One distasteful, but completely non-lethal example would be strong aphrodisiacs, especially if the chemical also caused homosexual behavior.”