When your in park, or neutral and you rapidly press the on the throttle to 40% or more, the full TEMS kicks in. It's normal.
You know what's really fun? Get to a speed of around 50mph or so (not sure exactly) and hit the brakes. You don't have to hit them hard, but stay on them until you come to a stop. While slowing to a stop, press the "soft" button for the TEMS. Wait till you come to a complete stop, then let off the brakes. After a couple seconds, your car will magically raise by an inch or so in the front.