Caporegime
Start with a note then if that doesn't work. Take a power drill to their tyres.
Trolley jack?I'm, unfortunately, known for my escalations. This would start with a polite but firm note telling them not to do it again. What state their car ends up in depends entirely upon how they respond.
Trolley jack?
That's down the line. Bird food of some description is a great starter.
Car or dog crap down the scuttle is another.