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when they can have 15 mins discussion.! G5 A( Z" q9 y! D. I/ B
make 1 of them to do a specific job whcih is countingtvb now,tvbnow,bttvb% u' d; n& b; z+ }% L
only him can turn on off off the light.* k" _. E! W3 B1 m, z9 A
Basically, if you are the first time to get in the room, turn on the light,
9 V2 h5 _* S2 e  X, gthen wait for "the special man" to turn the light off....TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。$ ]0 l3 R0 x  \: u) k# y% N
when "the special man" count in up to 30 (included himself)
% F9 Q2 s( v3 B$ s# M. jTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。then it is done!