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i know!, b/ N* u4 ~7 K- |- V
when they can have 15 mins discussion.tvb now,tvbnow,bttvb8 ]0 p3 e  H* k- V; O1 L& g
make 1 of them to do a specific job whcih is counting
$ x/ X. J/ N7 y3 Monly him can turn on off off the light.
( z: i1 q# F" n5.39.217.77Basically, if you are the first time to get in the room, turn on the light,
% `1 l. e4 h- W2 }+ p1 Z1 |5.39.217.77then wait for "the special man" to turn the light off....3 c, x. _2 y4 @. {3 z
when "the special man" count in up to 30 (included himself)
4 r# |, U: N' H3 p+ Ttvb now,tvbnow,bttvbthen it is done!