Beware of that crying baby...
Speed isn't the only factor affecting the sonic boom. Size and altitude also plays a vital role.
Fly often? If you do, who gets the arm rest? You? Or your neighbor?
All you need for this trick is a twenty-five-cent piece and a small postage stamp. Put the stamp on the desk and hold the quarter horizontally about half an inch above the stamp. Now blow hard down onto the quarter.Now blow hard down onto the quarter.