Church people parking in my yard.

[Gunbuster]

http://en.wikipedia.org/wiki/Caltrop

 

[PokerGuy]

I must say, I never stop getting a chuckle out of some of the ideas posted in threads like these

 

[unokitty]

Tank traps.

Go big or go home...

Uno

 

[dank69]

Flyer their cars with pages from the Victoria's Secret catalog.

EDIT: Guess I should have read the thread first:

Large boulders

I think he might get in trouble for papering their cars with pics from Jugs though.

 

[SunnyD]

Razor wire.

 

[IronWing]

Spray liquid manure on your yard.

 

[Humpy]

Jesus would pave the area with asphalt and hang around to help people out of their cars and hold the umbrella. :|

Just do the right thing OP and resist the temptations of the evil ATOT.

 

[VulgarDisplay]

2x6's with framing nails pounded through them placed on your property where they are parking with a sign that says no parking.

Or you could buy a valve stem puller.

 

[KeithTalent]

Yeah, burn a pentagram into the grass that should keep the heathens away.

KT