Okay, I'll say upfront... I'm the ninny who can't figure this out!

Many times when I go to get out of our car... and I open the door... an alarm goes off. I get this beep beep beep to tell me something is wrong. But I can't figure out what it is. The headlights aren't on. The car isn't still running. I've turned the car off... and I'm just going to get out.

Does anyone have a clue what this is? I wish I had an alarm like this go off when I leave the car running accidentally. The big problem I'm facing is that this constant alarm every time I go to get out of the car is actually desensitizing me since it happens pretty much every time I go to get out.

What am I doing?