Lightning

Lightning is a weather phase in The Sims 2: Seasons during heavy storms. Lightning rarely happens when the Sim is inside a building, but if the Sim is outside for a long time, they will get hit. Lightning can also be attracted to a lightning conductor, like a hot tub or a hot spring. Sims soaking in one of these during a storm will be hit by lightning VERY frequently. It is also very likely that after getting hit while IN the hot tub, the Sim will also be struck by lightning as soon as they step OUT of the hot tub, resulting in near instant death.

Lighting can also hit trees, causing them to catch fire.