A Terrorizing Three

1. It's late at night, you're alone at the computer and everybody else is fast asleep. Suddenly you hear the unmistakable sound of the front door creaking open. What do you do?

2. You're sound asleep dreaming of pleasant things when you hear a loud roar "I am Sambooza, and you are...lunch!" What do you do?

3. You're walking to the grocery store on a sunny, cloudless day. You suddenly notice that oddly enough, there's nobody else on the streets. Just as you're pondering over that, it gets dark, as if something huge had covered the sun. You look up and see - what?