9 Ways To Hypothetically Sabotage Someone's Car

A few, starting with harmless but annoying and continuing to proper revenge:

• Wrap their car in clingfilm
• At a store / supermarket that has coin-operated carts / trolleys, lock them all together in a circle around the target car
• Fill their interior air vents with glitter or those little paper circles from a hole punch
• Pour fish sauce / other smelly liquids into their (cabin) air intake
• Remove their locking wheel nut key then give them punctures
• Swap the fuses around in their fusebox(es)
• Pour corrosives into their ECU
• Drop swarf into their engine through the oil cap
• Use an oil extractor to remove their engine oil

Poor a bag if sugar in the gas tank.

Pour sugar in the petrol tank that will f*ck it up :D

disconnect ground terminal

Rice

Remove their valve cores.

Drain their turn signal fluid, they probably don’t use them anyways.

Sugar in gas tank. Cruel, don’t do it, but it would destroy the engine.

On modern cars (and if you have access to the keys) change the settings of ALL the memory-functions.

Put Honda badges in it ;)