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i know!5.39.217.77:88988 i( b: I5 r# H- L/ d& E2 N' v6 Y
when they can have 15 mins discussion.tvb now,tvbnow,bttvb- o+ S, d: R9 M* Z& r% w
make 1 of them to do a specific job whcih is counting
, h& r0 l, z$ w8 g% ptvb now,tvbnow,bttvbonly him can turn on off off the light.
0 M" S" c& Q0 w* `8 _& g! H5.39.217.77:8898Basically, if you are the first time to get in the room, turn on the light, / E3 u; l6 v! O" b5 b, o5 X+ G
then wait for "the special man" to turn the light off....5 `5 h+ d. {- K+ Z, ]
when "the special man" count in up to 30 (included himself)tvb now,tvbnow,bttvb  K# G  ^* @) K) E
then it is done!