New Zealand Music Puns

Here in New Zealand we have an ice cream van that drives the streets and sells ice creams, called Mr Whippy (there are others but they are the best and been around the longest!). When ever my kids hear the music playing in the distance (and I used to do this to my niece as well) I tell them they are playing the music to let us know they are out of ice cream. My niece believed me until she was 10 (now 15), my daughter only fell for it until she was 5 (now 8) and my son (4) has never fallen for it!