Inappropriate Laughter and Behaviours: How, What, and Why? Case of an Adult with Undiagnosed Gelastic Seizure with Hypothalamic Hamartoma. By HPN Admin | June 25, 2020 | National Presentations, Publication | 1 | 2020-06-25 14 July 2020 Beckwith NL, Khil JC, Teng J, Liow KK, Smith A, Luna J. Hawaii J Med Public Health. 2018 Dec;77(12):319-324. PMID:30533284. FREE Online Download