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i know!
% l' X8 G' v* N: C$ {. Vwhen they can have 15 mins discussion.公仔箱論壇, ~7 k) n$ N4 d9 L9 T
make 1 of them to do a specific job whcih is counting
5 Y% T1 ]1 D: u, Y* B) YTVBNOW 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。only him can turn on off off the light.公仔箱論壇* [- u, D+ E. t1 ^# g7 C2 D. i
Basically, if you are the first time to get in the room, turn on the light, 9 a$ H2 r3 r; v: s- t
then wait for "the special man" to turn the light off....
0 F; P0 u1 |! I( b+ v5.39.217.77when "the special man" count in up to 30 (included himself)tvb now,tvbnow,bttvb( @! ~8 N  }- a2 W0 d4 u1 M
then it is done!