Q. When is a door not a door?

A. If you ask a 10-year-old with a joke book: “When it’s ajar.” Otherwise…whenever somebody says so.

Exhibit a) from Trent in Melbourne, Australia:

Exhibit b) from Michael in North Carolina:

Exhibit c) from Laura in Greenville, South Carolina:

Exhibit d) from Shannon in Albany, New York:

Exhibit e) from Summer in Austin, Texas:

And lastly, a straight-up Magritte shout-out:

related: The existential crisis of a water fountain

Well, lookie here: this office in Florida has a “Jeff” of their own!

related: A citation from the fat police; Sprinkles are for cupcakes

Writes Stacey in Massachusetts: “The church around the corner from my house is famous for the little rants on their sign, but this one definitely takes the cake.” Obviously, texting while driving isn’t cool, but as Stacey put it: “For a church, it just seems a bit…hostile.”

Meanwhile, I just opened up the August issue of Texas Monthly to see this slightly more gently worded version…

related: Sincerely, God

extra credit: Church sign generator

Note: the following message has explicitly NOT been approved by Jack Donaghy. (Do not be fooled by that GE logo at the bottom of the page.)

Remarkably enough, our submitter, Dan in Milwaukee, says the following message was NOT penned by a satirical television writer, but rather by an anonymous member of the office Green Police. (The two pennies — payment for 2011′s extra energy usage — were then added later by an anonymous member of the office Bullshit Police.)

This is, of course, simply a new strategy in the ongoing war being waged in kitchenettes across the world by the United League of Office Workers Who Have Nothing Better to Complain About.

related: Some of have OCD and unused microwave time drives us crazy

“The crayon note showed up about two months before the response,” says Monica at Goucher College, “but both have been a source of great entertainment.”

related: Comrades, take notice!

extra credit: A lesson from Barney! **********

Gloria in Pennsylvania spotted this warning — sort of a New Testament twist on the old “lamb’s blood on the doorpost” trick — posted on a neighbor’s apartment door.

Now, maybe it’s because I’m a godless heathen, but if I ever took up a life of crime, I think I might find this sign from a West Virginia convenience store (as photographed by Matt in Brooklyn) just a bit more convincing.

related: When sleeping, you will get burned and die immediately!