UMM i got a question i tried makein my sis and her friend to wet the bed with that trick and the puttin thier hands in the glass of water.Cuz i want to get back at them for something.well anwayz....i tried it and it didnt work....can anyone tell me y or how to make it work...i heard if u sue different tempatures of water itll work is that tru....someone plz help i realy want to make it work plz tell me how i could make it work