There is nothing more satisfying than changing your voice and confusing your grandma on the phone. So a bullhorn type voice changer to broadcast your voice across the house is 1,000 times better to freak out everyone. With it you can create hundreds of voice modifications with the slide levers to provide hours of exclamatory entertainment.
Talk deeper like Darth Vader, or like a robot, or even like your crazy Aunt Sally...anything is possible if you apply yourself. Afterall, the effort you put in it, is the same as what you get out of it.
Here is a sample of the craziness to be had: