For a week or so a series of signs have been popping up all around New York City.

Artist Jay Shells (Jason Shelowitz) has turned into a one man urban etiquette squad, taking on issues like walking on crowded city streets while texting, disposal of cigarette buts- and even reminding the NYPD mounted unit to clean up after their horses.

Signs can still be found around town, but they are rapidly disappearing.

One of them, minding people to pull up their jeans (nobody wants to see your underwear) is missing from several spots where it had been placed by the artist, as well as some of the ones pictured above.

Are they bring stolen?

Or has the artist been "requested" to remove them from public spaces?

Earlier this year he was asked to remove subway etiquette signs that were posted in stations and trains.

Here are some pics of some remaining signs from what Shells calls the "Metropolitan Etiquette Authority"