Please Don't Tell is a speakeasy bar inside MO Bar on the second floor of the Mandarin Oriental hotel in Central, Hong Kong. It serves cocktails along with hot dogs topped with creative ingredients, Thai-style potato balls, and pifengtang hot dogs. Guests enter a password at a phone booth, and a staff member comes out to let them in. The bar is small and gets crowded even around 5 p.m. on Fridays.