9 Ways To Hypothetically Sabotage Someone's Car

Drain blinker fluid

Drop a grenade in the fuel tank? No that’s a tad bit too dangerous… Er….Hide it somewhere?Lay spikes to puncture the tires?

Paint the brake rotors

Paste an embarrassing logo from another brand, for example, an STI logo on an evo, amg on an M3, ‘hibrid’ logo on a Raptor

Cur off their Catalytic Converter.

Or just put a Trump sticker on the back of their car. Someone else will do all the work for you.

Sugar in the oil. it’s all good till the motor cools down.

I helped a buddy with tuning his car a few years back and played all kinds of pranks on him during that time ^^ Didn’t hurt the car or him, just drove him nuts.
After we put in the new suspension i was tasked with putting on the tires. I taped some cardboard to the inner fenders. He thought the tires were scratching and he ran around the car for 10 minutes until i started laughing.
One day we did some engine stuff. Before the test drive he went to do some private business. I used the opportunity to swap some spark plug connectors. He thought he killed the engine. I was very amused.
The day he nearly ran me over was, when i swapped out his new rims. He had some stuff to do, so i was at his garage waiting for the delivery guy with the rims. The guy came. I opened up the boxes, placed the new rims in the next room and put some old rusty steelies in the boxes. Never seen him that furious.
Fun times. And in the end he always laught about it as well.

Actually welding a diff of a FWD car isnt bad. I have seen many track FWD cars with welded diffs

I would be happy if someone stanced my car