Introducing Toilets of New York, a Tumblr devoted the the peculiar artistry of the dive bar toilet. (Finally!) The site features dozens of photographs of the gross, the graffitied, the ugly—and in some rare occasions, the clean.

The blog is the brainchild of Ian MacAllen and largely features hipster spots in Brooklyn and the East Village. The Observer reached out to the toilet traveler and asked him how, exactly, he came to chronicle crappers.

“I realized someone was taking a whole lot of time on these bathrooms. They’re really delicately curated, both the objects in them and the wallpaper,” he told The Observer.

But when does inspiration strike? Mr. MacAllen said he choses his "subjects" based on where he happens to be hanging out. And while he doesn’t go to bars solely in search of the next flush, he admitted to taking a leak just to check out the facilities. And after two months of toilet touring, he’s starting to notice patterns.

“To me, the graffiti in the bathroom is something kind of in itself interesting,” he said. “Some [bathrooms] have the classic New York City subway tiles, some have this black and white theme from the 1920s.”

Now, next time you drunkenly stumble into the bathroom at Duck Duck or Cherry Tavern after one too many PBRs, you’ll know what you’re in for. Which is, in some cases, toilet paper all over floor, empty glasses on the back of the tank, red mood lighting or our favorite: a sign that reads “PLEASE, PLEASE PEE ON THE TOILET AND NOT ON THE SEAT."

Click through the slide show for a sampling of the Toilets of New York’s photos. Just don’t forget to wash your hands.

Be careful where you go potty.

You may have already heard of Mister PeePee, a man on a mission to go around jerking off in every Starbucks bathroom in the city and then rating the lavatory on several key factors. (I.e. cleanliness, whether or not anyone knocked while he was trying to do his business, coffee taste). What you don't know is how Mister Peepee is actually doing you a service.

First of all, think about how time-consuming this prospect is. There are approximately 298 Starbucks in Manhattan, and unless this guy can masturbate to completion more than twice a day, every day, than it's going to take him almost half a year of non-stop jerkin' in order to complete his project.

Secondly -- and we say this as a group comprised of at least some women -- we'd like to know where the cleanest, friendliest Starbucks bathrooms are. Sometimes you just need to go, you know? And yes, when you use a bathroom at Starbucks, like all public restrooms, there is already a built-in issue of wondering whether or not someone has masturbated onto the toilet seat. It's just part of life! At least by following Mister PeePee's FourSquare account you will know for sure that masturbation has occurred in the bathroom, and that - since Starbucks employees will hopefully also be clued into the situation - the room has already been sterilized with lye.

If you are more of a citizen journalist type, you could always use Mister PeePee's list to see the locations he hasn't visited yet, and then lay in wait until you hear moaning behind the door. Then it will be your time to pounce!