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i know!
: T9 K5 i  P2 B' j* vwhen they can have 15 mins discussion.
' W- x9 w, O: s1 \4 W6 M4 e  Wmake 1 of them to do a specific job whcih is counting
8 ?: r+ S  H# t1 F) J" d- ?only him can turn on off off the light.
- |8 P: P2 g4 l  [; I公仔箱論壇Basically, if you are the first time to get in the room, turn on the light,
$ u7 U! R( @& Z0 u6 [* D: Fthen wait for "the special man" to turn the light off....6 g* }+ o3 ]# m3 x
when "the special man" count in up to 30 (included himself)
+ R3 f: z4 b/ {  A5.39.217.77then it is done!