Get some Ivory bar soap. Use it to write anything you want on the window. It will take forever and a day to wash it off. Wont hurt anything.

 

how about balancing something on the rear axle with a string tied to it. Such as some feminine products of the sort or a real life baby doll. Then when they start driving it'll fall down and drag behind them.

 

Movie theatres have lots of popcorn left over at the end of the day. When I worked there we filled a guy's jeep with that stuff. Started a fun little war.

If you really don't like them, fresh dog turds smashed down into the HVAC intake will do the trick. Don't know who my friend ticked off but his car smelled bad for a long long long time.

 

Take a condom and put it over their exhaust pipe, then put a zip tie around it so it can't fly off.

Saran wrap is always a good one though, probably one of the easiest.

 

We do a lot of dumb stuff to eachothers trucks at work. Just easy stuff like putting bottles over antennas, closing in the side mirrors, stacking shopping carts in the bed. My buddy has an old beat up Yota. Me and 4 otherguys pick up the back of it and turned it so he couldnt get out till two other cars moved. Just think easy and it can be funny.

 

We buried a guy's Dodge Dakota in snow in college. You could not tell what brand of truck it was we put so much snow on it.

 

Depending on the grill they have, crack open a can of sardines and put it in the grill and when they turn the heat on it will almost run them out of the cab

 

Thats classic.

 

if they have a vehicle with the custom seat adjustments when you get in it and push number one or two, when you go over there, get in it and change the setting to as close as possible to the steering wheel and lean it as forward as possible....i figured that out after getting in a friend of mine's mom's car. she is really short, and i am six foot, and she said take my car and get something to eat and i when i got in, my kneecaps where in my mouth.

another thing you can do is tie a 4 ft rope around something random and stick it up under their vehicle so they dont see it when they take off. then they will be going down the road dragging crap.

 

We always just make a trip to WALMART and pick up a value pack of condoms, some whipped cream(in the can), and lots of saran wrap! Put some of the cream in the condoms and place over first layer of saran wrap(so not to damage paint), then saran wrap more.

 

my dad told me they used to catch armadillos and stick them in people's mailboxes. i think that snit wouldbe funny. an armadillo jumping into your lap.