When my grandparents sleep, I'm going to rumple their laundry.
That is very childish, why would you do this?
I can't stand their old ass rules and this is the only way to take my revenge.
While it's something harmless, you are still making your grandparents' lives harder. You are being rude and disrespectful to them, who are letting you live at their place. You need to grow up and just talk about your problems.
That's the one thing I hate about them. I'm going to find a way to accommodate their bad habits.
If you have problems with them, just talk to them and find a middle way. If you cannot, just move somewhere else rather than being rude to your grandparents.