Un-freakin'-believable!
There is just no respect, man. I've got similar worries about my T-bird which is parked outside (no garage). Your hearse and my 'bird stand out compared to what most everyone else drives and hence tend to attract the idling, egg-slinging low-lifes who have yet to do some real work on this earth. Back in my school days, I had a nice and clean '78 Ford LTD II as a daily driver which got egged multiple times. Frankly, if I were an egg-thrower, I would get more satisfaction from hitting a BMW speeding thru the streets in 4th gear than from contacting a parked land-yacht the size of a Crown Vic... but hey, maybe I aim high and set lofty expectations for myself.
If those were my kids who egged your property, they'd be begging to go to the police chief for vandalism charges by the time I'm thru with them.
Apologies for the lengthy rant, but @#$% like this really touches off a nerve. All of us work hard and when we finally get some free time, we like to work on cars or other hobbies, and the latter doesn't include cleaning up congealed albumin and egg yolk proteins.