1: Rip off his head and impale it on a spike next to the space. History teaches us that this is an effective deterrent/healthy snack - dependent on whose history you read.
2: Dig up your parking space, fry it in a little butter and force-feed it to the little shit with a spade. If he refuses, gee him along some with a shot gun. Once he has consumed your parking space he will find it immensely difficult to park on it. Unless he is
Brian Harvey.
3: Get yourself on eBay and pick up a tank.
A Challenger II(pictured) should do it. Then you can park wherever the fuck you like.
4: Chop off his head with a machete, considerably reducing his depth perception skills.
5: Disguise your parking space as a Job Centre.
6: Employ a traffic warden and don't feed it. They are more dangerous when they're hungry.
7: Draw a salt pentagram on your space. When he parks there, Satan will belch his foulest minions up through the bottom of his motor and, with careful aiming, directly up his bum-hole. He will hence be dragged kicking and screaming into a burning pit of hideous damnation by his anal sphincter, courtesy of two, miffed, Angels of Death.
8: Report him as a terrorist. He'll be detained without charge for an ever increasing number of days, and with any luck he'll get a good hard sodomizing with a broom-handle into the deal too.
9: Knee-cap him. (Note - only effective if your space has shit disabled access, most do).
10: Excavate your space and fill it with shit and Semtex. Cover with something black. Should he park in your space again, he'll find himself un-parking upwards at quite some velocity. He'll also be covered in shit.