A Wacky Whistle is the world's most amazing whistle. The Wacky Whistle is a magical little whistle that goes in the roof of your mouth that allows your mouth to produce a high octave frequency and lets you make awesome sound effects. It vibrates so fast that it can be quite ticklish. It really is quite amazing and a lot of fun to use. This whistle is fast becoming the most popular accessory for kids (age 8 and above) and teens and is super fun sharing with friends and family.