Yes, curveball ahead. Which I'm not going to tell you about right now.
Don't worry, I'll get you up to speed when it smacks me in the face.
In the meantime, here is a video of a skill I taught every brother I own.
If you flap your lips like a horse and then squeeze the corners, you too can sound like a weed-whacker.
These two hooligans have not yet mastered the art, but you can. Just remember to keep a steady air-stream going.
Gee whiz, my parents sure do love when I bring my college findings back home for the children!
I think that might have been sarcasm. ^