“Emergency” snacks for various situations

You chill out at your place and unexpectedly hear a ring at the door-bell. You are a bit surprised as you don’t expect anyone. You open the door and you notice colleagues that apparently make up their mind to pay you an unannounced visit. You haven’t seen them for a while so you are glad they are at your place. On the other hand, you badly try to think of something you can treat your visitors with. You are sure you don’t possess all ingredients to prepare something nice to eat right now.