My cousin bought a huge box of forks and as a prank shoved 500 of them into a friends lawn. If you do it with the fork tines pointed down, it's a lot easier. With the tines up, it's more menacing. 100 or more plastic forks in the ground pointed up is a very menacing sight. The kind of menacing site that might stop your mark right in their tracks wondering what the heck happened to the lawn?
Imagine how 1,000 would look!