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i know!4 y* i% q- B9 w; J; `* f) {  X8 E. {
when they can have 15 mins discussion.tvb now,tvbnow,bttvb  y" m3 h' c7 ]0 J+ n# R* v" l
make 1 of them to do a specific job whcih is counting
$ i  R% L: Y$ o4 n- ionly 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。0 ?) v. N( [- k1 x, q
Basically, if you are the first time to get in the room, turn on the light,
5 ]! s9 i2 I4 d; @5 K1 Wthen wait for "the special man" to turn the light off....5.39.217.77# M' Y: D( |5 B- i3 o- F1 q. L" b
when "the special man" count in up to 30 (included himself)5.39.217.77! u& R, m2 k! g4 {7 |" W" N
then it is done!