Im not very sure, it happens Randomly. you have to do it about 10 times, i bet it'll work, but dont do it one after another! Also, you have to wait for about 3-5 minutes, if nothing happens, that wasent the lucky try but it does work, a weird looknig Tamacoocoo bird pops out, it doesn work all the time, Dont get Discouraged ^_^
Change the time to about --:59 (any time before the 59) Example: change it to...8:59. Go to your Items, select the Cuckoo Clock. After a minute passes, the Clock will bong 9 times, because it is turning 9 o clock!! Put it to 11:59, minute later the clock will bong 12 times. 1: 59, it will ring 2 times etc. It is pretty cute!