When a Sim put on lights in that tree it will catch fire.

If you have The Sims 4 Seasons you can sabotage the Christmas Tree.

You’ll need The Sims 4 Laundry Day Stuff for this option. The fastest way must be not cleaning the Lint-Tray from your Dryer when using it.If you want it to crash, stuff fruit in the exhaust port if you have the Mischief skill on level 8. Go on a Space journey with your Rocket Ship with a low level Rocket Science skill.There is a chance you will cause a fire when Transforming objects with the SimRay (requires The Sims 4 Get to Work).Put on the fireplace with rugs underneath it and let the fireplace burn for a very long time.Use a low level Cooking skill on a cheap stove (try to cook grilled cheese, this worked for me).If you don’t want any Sim to die, extinguish the fire as soon as possible because it will spread out fast and can even go through walls. If you want your Sim to die in the fire, let them stand in it for a while and make sure other Sim don’t extinguish the fire. When there eventually is a fire on the lot, they will run away in panic. Causing a fire is actually pretty hard, it can take a lot of time. Your Sim can die in a fire that is mostly caused by the Sim itself or your interior architect skills. Start a fire while cooking, light up the fireplace or crash land with a Rocket Ship If you want, you can even resurrect a ghost into a living Sim again. When a Sim dies it doesn’t mean they are gone forever, they can come back as a ghost and even join your household. When new expansions are released with new death types, this guide will be updated. If you want the easy way out for your Sim you can use the Death Cheats mentioned in this guide or can be found on the cheat code page.

When you are trying to kill a Sim it will be much harder in The Sims 4 than in the previous Sim games but it’s definitely doable. They can die by Old Age, Overexertion, Electrocution, Hunger, Fire, Drowning, Cowplant, Embarrassment, Laughter, Rocket Ship Crash Landing, a Cardiac Explosion and more new deaths Death by Steam, Death by Pufferfish, Sunlight, Poison and Guinea Pig. There are a lot of different ways your Sim can die in The Sims 4.

Sims 3 killing other sims