I just came in here because of the awesome picture. Billy Mays, the "oxymoron" as some forum poster once referred to him.
I can't do any Mario voices. I might be able to do a couple random Yoshi noises though, which are really just single-syllable sounds at a certain high pitch. Only very recently have I been able to rise my voice to nearly three octaves above normal (as opposed to barely two). But at that point I'm squeaking out faintly, not having the power (nor using my diaphragm properly) to make it audible.
