Here's the scenario........
It's Friday evening and you've arrived home from work, ready to enjoy the night at home watching a movie. Your home is averagely tidy and clean, your fridge and cupboards contain the food and drink they're normally stocked with, nothing special.
At 7pm the doorbell rings. You open the door and two couples are standing there, friends of yours that two weeks ago you invited over for supper tonight. You know them all well enough for the *surprise* dinner party to be fairly casual, but not well enough to say "Oh shit, we completely forgot you were all coming!"
While they are enjoying their welcome drinks in your living room/garden/on your patio, you have about 5 minutes to escape to prepare the meal, perhaps another 15 minutes for cooking/boiling/baking while you enjoy a drink and chat with them, and then 5 minutes for throwing it all together.
What would you make for your instant dinner party, using only what you usually have in the kitchen, so that they'd never suspect that you'd forgotten about the invitation?