Good prank suggestion?

So i was watching the office and decided to prank my family instead of studying for my exam tomorrow. They are away on vacation and left me alone in this house for 10 days. Give me prank ideas where no one gets hurt and i don't have to spend a lot of money So far all i did was screenshot the background of my sister's computer set it as her background and hide the desktop icons and taskbar. Got the idea from reddit.
Answers

uncdi

Nut on the ceiling fan. When they turn it on your semen will fly everywhere!

Jahal

The office pranks were funny because everyone was there to react to them, also becauseit was fiction, they weren't real. Do your work and leave the foolishness to Dwight Shrutt.

linz

drug your significant other, put them in the trunk of your car and push the car in the ocean, then have their long lost friend come scuba dive and open the trunk to rescue them and its a good prank because your significant other thought they were gonna die but really they got to see their old bud.

David

As a prank tell them that you passed your exams!

Causedoesnotprecedeeffect

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lili

drug your significant other, put them in the trunk of your car and push the car in the ocean, then have their long lost friend come scuba dive and open the trunk to rescue them and its a good prank because your significant other thought they were gonna die but really they got to see their old bud.

Anonymous

get little babies and putsugar in them print some fake money put it kn a case get some fancy clothes and sit at a desk and act like its a drug deal and let youre mom catch yo also side tip act like your getting mad after she catches you and start eating the sugar out of the bags that looks like cockaine

Jan

Turn everything upside down, they will get a kick out of it.

Luke

When someone next goes into the toilet throw a fire cracker through an open window or just as the door closes and hold the door so they can't get out

Casey Y

Gift wrap the kitchen. I would do it cheap with newspaper or paper bags. Seriously, put gift wrap on everything...every single spoon, glass, plate, pan, spice bottle, utensils, etc. With 10 days, you've got the time and I bet they would find it funny.

joshua

You could make exploding paste and slather it on things only they will touch, all you need its 3 parts amonia and 1 part iodine crystals, just dont put it on anything too fragile or valuable because it will break stuff