1. ANY, vehicle really hates other vehicles. Do not touch tips.
2. They also hate buildings.
3. Tanks especially hate everything.
4. All vehicles have the Bohemia Interactive ♥♥♥♥ off or explode device when touching something.
5. People are flimsy pieces trash that will die when scraping against the side of a car going 2kmh.
6. Planes, helicopters, cars, boats, subs, and anything that can move will turn the Earth into its own tectonic plate trampoline when falling to the planet.
7. (I don't know if this really has to be said but...) Don't violate the laws of physics and put two objects in each other. They WILL explode, fly, and kill you in that order.

Just don't do anything that you think a drunk driver would do.
BUT, if you do it is very fun with friends in Zeus or when you get bored in some game mode. Also it is very good Anti-tank if you have jack.