Now we have to clean up the eggs or he will tell our parents.
How did the eggs get there in the first place?
We threw eggs at his car.
It was very naughty of you to throw eggs at somebody's car. You should apologize for doing such a thing. You'll get in big trouble for throwing eggs at people's belongings.
It wasn't even my idea. It was Nick's fault.
Even if it wasn't your idea, you still participated in it so you should clean up the eggs and apologize. If you don't then I'm sure your parents will be very disappointed.