"Shit List" memo pad
Design Warehouse Santa Fe sells this "Shit List," a small memo pad onto which those that have dared cross you can be inscribed along with their transgressions and your "Plan of Attack". We use something similar around BBG to keep track of people who bother adding comments that read "How is this a gadget?" and "TL;DR", except the "Plan of Attack" field is auto-populated with "Snicker at; ignore."
The Shit List is $7 plus shipping.
Product Page [DesignWarehouseSantaFe.com via Uncrate]

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not sure what this means, but
"TL;DR"
is submitted for your amusement.
Uh-oh,
Looks like someone is CATFOTFIC.
how is this a gadget
That looks like a pad from Knock Knock - they make some deceptively funny stuff: http://www.knockknock.biz/commerce/Pads.html
This is available at Urban Outfitters-along with other "funny" memo pads
Damn, pork musket beat me to it. Still, I want to be on the list, so:
How is this a gadget?
Oh, and:
I TOTALLY want to get one of these. That way when someone pisses me off, I can say, "Ok, that's it! You're on the list!" And then I can proceed to whip out an actual list.
Hmm...that brings up an interesting dichotomy with this item. If you use it publically and tell people you're putting their name on the Shit List, it is a humorous novelty item. However, if you keep it private and secretly note down everyone who's done you wrong, it becomes creepy and somewhat pathetic.
cubby96 & SAMF: on my list for using both jokes first.
Apparently it is a knockknock pad:
http://www.knockknock.biz/commerce/Pads/Shit-List.html
While the gadgetness of the shitlist pad may be debatable, the gadgetness of the "all out of" pads is absolutely undeniable:
http://www.knockknock.biz/commerce/Pads/All-Out-Of.html
http://www.knockknock.biz/commerce/Pads/All-Out-Of-Office.html
If the next school shooter has one of these, you can bet they're gonna get sued as aiding and abetting.