At times they will pop their head out of the sand.

A woman popped her head out from the apartment across the hall.

At that moment Will popped his head around the corner.

"Our athletes are going to do great," said a man, who just popped his head into the door.

Rebecca popped her head back out into the living room.

I popped my head underwater to see where his feet were.

At once a servant popped his head around the door.

Then, popping his head back into the living room, he'd say, "You guys are going to love this!"

His sister popped her head out from inside the mule.

Steve stepped quickly outside, then popped his head back into the room.