1. Drawer + cutting board = instant counter space in a crowded kitchen. reddit.com Don't use this as a surface for cutting since it could potentially tip over and wound you, but it's a good way to keep all your ingredients neat until it's actually time to use them. 2. A second shower rod means you can hang a bunch of caddies and loofahs. imgur.com It'll halt the eternal battle for shower shelf space in its tracks. 3. And for the rest of the bathroom, an over-the-door shoe organizer adds a ton of extra storage space. brit.co 4. To subtly signal that one of you is getting some, put clear tape over the door's keyhole. Shutterstock It's an excellent alternative to a sock or a scrunchie. (Although not, it should be said, better than simply texting and letting your roommate know they're about to come home to a bangin' fandango.) 5. Invest in a sex fan. Shutterstock It's just like a regular fan, except that you turn it on to block out the noise of moans and creaking. It's even better etiquette if you are the sex-haver in question and turn it on yourself so your roommates don't have to. 6. Use apps like Splitwise and Venmo to make keeping track of and splitting bills a cinch. splitwise.com Sounds like a wicked chill house. 7. Chore charts can make the world go 'round. hipgirlshome.com It totally varies from apartment to apartment and group to group, but having a rotating schedule can help minimize squabbling, resentment, and grout mold. 8. This slot method works for especially large groups of roomies. imgur.com / Via reddit.com 9. And charts (be they on whiteboards or Google docs) make keeping track of who owes whom money a lot easier. imgur.com 10. Organize your entryway with a divided tray. iheartorganizing.blogspot.com Break it up into compartments for each roomie to ensure you never leave without your stuff, or accidentally with someone else's. 11. Use nail polish to differentiate between your keys. abubblylife.com 12. Brush long hair before going in the shower to avoid clogged drains. And, more significantly, to avoid (or at least lessen) arguments over whose hair wad is the plumbing culprit. 13. Gentle reminders help make hard-to-remember tasks way easier. reddit.com As long as it's not undertaken in the spirit of passive-aggression. 14. Hang a helpful reminder by the main door. instagram.com This makes sure that empty beer bottles and frozen pizza boxes get down to the curb in a timely manner, WHERE THEY BELONG. 15. If you have a dishwasher, mark it as clean or dirty with a magnet. etsy.com So there'll be no excuse for leaving dishes festering in the sink. Available here. 16. Keep the noise of a coffee grinder from waking everyone else up by wrapping it in a pillow or an oven mitt. instawares.com It should dampen the sound. Bonus: Your pillow will smell rad. 17. It goes without saying, but be as prompt with money and as courteous as you want to be treated. smosh.com 18. (Although sometimes desperate times call for desperate measures.) designtaxi.com 19. And always make sure nobody feels like they're being taken for granted. smosh.com 20. If nothing else, treat your roommates to this incredible display of witchcraft. imgur.com You'll be lauded as a hero.