Joyis booked!

Joy is booked!

(Pic taken at SMK Sri Kota, Taiping. 2009)
I remember Jack Lord used to say 'You are booked!' in the long running series 'Hawaii-Five-O' but then of course, it is a different 'booked' I am talking about here. 'To book' is to enter charges against in a police register and that isn't what joy is all about. So, what do you think is the meaning of this 'joy being booked'?
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