Because the toilets in Hainan University are squatting toilets, not toilets.

Hainan University, referred to as Haida for short, is located in Haikou City, Hainan Province. It is a university jointly established by the Ministry of Education and the People's Government of Hainan Province, a university jointly established by the People's Government of Hainan Province and the Ministry of Finance, a comprehensive key university in Hainan Province, and a key university in Hainan Province. Ranked in the national "double first-class" and "2 1 1 project". Selected into "Excellent Engineer Education and Training Plan", "Excellent Legal Talents Education and Training Plan", "Excellent Agricultural and Forestry Talents Education and Training Plan", "Basic Capacity Building Project of Central and Western Universities", "Comprehensive Strength Improvement Project of Central and Western Universities", National Postgraduate Project of Building High-level Universities, Scholarship Receiving Institution of China Government for Foreign Students in China, Demonstration Base of the Ministry of Education for Studying in China, National College Students' Cultural Quality Education Base, and National College Students' Innovation and Entrepreneurship Training Plan. The school is jointly established with Tianjin University.