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i know!" }# _  O1 x  S# @* o
when they can have 15 mins discussion.公仔箱論壇1 u& @( Y* w6 n' d
make 1 of them to do a specific job whcih is counting. w0 w* K- h; ^& ?* r8 y+ _
only him can turn on off off the light.tvb now,tvbnow,bttvb3 e1 J& H, I3 U$ D0 p/ W* d) Y$ D
Basically, if you are the first time to get in the room, turn on the light, 5.39.217.761 {- L" A# R% S; k3 {
then wait for "the special man" to turn the light off....
1 F( @7 P% q+ t' v0 z" b公仔箱論壇when "the special man" count in up to 30 (included himself)
0 q+ C3 E& d& U% D" R; R公仔箱論壇then it is done!