So recently, the weather has dropped to bone-chilling temperatures since winter is now here. This morning it was -10*C.

Anyways, after my drive to work, I opened my door to put my boots on and within 15 seconds of opening the door I hear this loud POP.
It was loud enough that I could actually feel it.

When I got back from work, (-2*C now) I opened the door and it did the same thing.

My question is, What is popping? And is it hurting anything?

 

Where is this pop coming from?

 

Since I've only heard it twice, I assume it's coming from inside the cab.
And I might be mistaken, but I'm going to take a guess at somewhere near the dashboard.

 

Listen to the very last seconds of this video clip. YouTube - 06 F150 Magnaflow Exhaust

Is it something like that?

I have only heard this twice, and it was a couple days after i got my new exhaust put on. It happend just like what you described, 15 seconds within opening the door. And honestly i did not even hear this popping noise until i looked at the video clips i had made (or i did and did not realize it). I havent heard it again yet though, but not knowing what it was is still bugging me.

 

It's the headlight relay.
Or, it is coincidentally timed when my headlights shut off.

I heard the sound while getting the mail, and I noticed that it was when the headlights shut off. So I hit the unlock button and let the lights run through it's cycle...and sure enough, the popping noise happened when the headlights shut off.

Sadly though, I can't make it do it again now that I'm in the driveway and looking for it.
Atleast I figured out what's causing it.