i know!公仔箱論壇7 H+ p' ~/ n9 ~9 c& W5 o
when they can have 15 mins discussion.8 p, w8 c; P! }; Y% l( N) z
make 1 of them to do a specific job whcih is counting公仔箱論壇" a; o8 ]. `( _# y% s! O& F( e( B1 a
only him can turn on off off the light.
) P/ R0 [, T$ X7 \tvb now,tvbnow,bttvbBasically, if you are the first time to get in the room, turn on the light,
8 v" `! t1 o# c5 m( B/ D& o公仔箱論壇then wait for "the special man" to turn the light off....
4 ]& t/ K! ]6 M9 E# |# y& }1 k Q公仔箱論壇when "the special man" count in up to 30 (included himself)公仔箱論壇0 S q" @' F+ y4 X
then it is done! |