Wacky Whistles are a magical whistle that goes in the roof of your mouth and changes your voice to a high octive so you can make awesome sound effects. It vibrates so fast that it can even be tickalish. It really is quite an amazing whistle and a lot of fun to use with all the sound effects it lets you make. 
Fast becoming the number one fun toy to have, it's great fun to have at a party and will raise the ambience at any event! They make a great bird whistle too, you can make a large variety of bird sounds as well.
The trick to have long lasting whistles is use until diaphragm begins to change from clear to white, take out, rinse and dry.  THEN REPEAT...