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i know!
: {3 d/ A$ ]& |, W4 itvb now,tvbnow,bttvbwhen they can have 15 mins discussion.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。( B# ^8 W6 P9 }7 h5 S
make 1 of them to do a specific job whcih is counting
& m8 s; W8 i/ q; @: P) Conly him can turn on off off the light.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。7 m; O5 L9 {9 f* v& o. L  z
Basically, if you are the first time to get in the room, turn on the light,
  l5 i, \6 e0 l. \tvb now,tvbnow,bttvbthen wait for "the special man" to turn the light off....
% G8 U5 r2 ?1 T" W% Z5 T5 _6 j公仔箱論壇when "the special man" count in up to 30 (included himself)+ K, m5 ^& F# F% @# E$ L
then it is done!