go wash it off rite now, the protein in the egg will actually eat the clear coat. wash it before it dry's if you can.
I hate disrespectful people but don't take it personal I am sure its just some kids egging houses and cars last night... probably wasn't a personal attack. People have no respect for others property these days but if it happened to them they would want to kill
take all the egg shells off to prevent scratches and just go to the car wash or grab your hose at the very least.