There is nothing funnier than the thought of pranks in someone's home. Perhaps you can rearrange their dishes in the kitchen. Perhaps you can put silly string in their living room. But here's an idea to take it to the next level: bear repellent.
According to The Sierra Club "The proper use of bear pepper spray will reduce human injuries caused by bears, reduce the number of grizzly bears killed in self defense, and help promote the recovery and survival of the grizzly bear." Bears are a big problem. It's time we eradicate them.