Go into the defend against the dark arts classroom after the lesson has finished(when your wandering about in the castle). At the far end of the classroom there is a door and to the right of it on the wall there is a balcony and on it lay about 10-20 beans. The way to get up there is by jumping on the chair just below it and jamming yourself onto the top bit of it(the place where your head goes). Then jump onto the balcony and there is your beans!
Hope I Helped
Happy Gaming ;-)
Added by: jamie duggan Jun 11th 2008, ID#12684