I'm thinking of spreading all the trash over the parking lot.
That's not a nice thing to do. Why do you want to spread trash?
I think it's fun and also fun to drive around in an environment that is broken down.
Spreading trash on the parking lot is a bad idea, you could get fined for littering in a public space like that. It can even get the police called for doing a disturbance.
No one is going to get upset over all this shit.
A lot of people will be upset if you litter like that. It's not a good idea to make your environment a worse place to be and to make things unsightly like that.