If anyone EVER tries to mess with my car here at the house, they will be sorry. No one will mess with my "baby". but say someone did...I wouldnt mess with the gas tank, if they retailiate they could do that as well...I'd probably get some rotten eggs and leave it inside the car (if doors are unlock), either way I would egg it, you could throw like rotten stuff at their car so it would smell bad and stuff. If you mess with their gas tank more than likely they will mess with yours to pay you back I wouldnt do that but thats just me.
but this is what i did to my mom's friends car for halloween one night just b/c they toliet papered our house and car like years ago. I found some kind of oxy clear gel crap, non-erasol hairspray (kind thats in the bottle),lotion, toliet paper, some other **** and I gooped their car up so bad it took her like 2 hours to clean it up. I took that gel crap and poured it all over the door handles, on the windshield, took some other stuff and sprayed it all over the windows and door handles, strung toliet paper all over the car, I got it good.
I snuck back in the back door and she invited us to leave with her so I acted like nothing happen and it was big surprise when they walked out and seen her car. I couldnt help but to laugh and my mom knew what I did and said it was the neighbors. She never toliet papered our house and stuff after that.
