What's up with this? Had a woman in the store today who came with her mother. Her mom talked normally, and despite having no mental impediments, this chick was talking like a f**k six year old. I could barely stand it. She was doing this on purpose. Every word that came out was played up with this "cute," high-pitched pronunciation. I nearly strangled her to death.
And of course there is the Fagspeech phenomenon. Gay men who don't have lisps, but pretend they do because... well, I really don't know. Just because, I guess.
And of course the valley girl thing. What makes people do this shit? Why are you talking weirdly?