I hear that in Windows 9, Microsoft will replace Freecell and Solitare with *War *and 52 Card Pickup.
Polka Band!
Or Progress Quest.
in The Video Game Name Generator thread could be useful.
Fencepainter!
“Tom Sawyer, you tricked me. This is less fun than previously indicated.”
Differential Calculus Wars-- Solve the problems to defeat the relentless swarm of alien invaders. Don’t forget to show your work.
There was a public domain lawnmowing simulator on the Amstrad CPC. The last game Sensible Software made for the Amiga was Sensible Trainspotting, released as a covermount with some Amiga magazine.
Well then..!
Non-interactive 45-minute Civil War lecture - in 3D public library setting
TurboTax 3DS.
Something that’s aimed at kids two or three years younger than your youngest. A Dora the Explorer game or something like that.
Laverne & Shirley’s Shotz Brewery Experience. 8 hours (with 2 15 minute breaks and a lunch hour) of quality control conveyor belt viewing.
Nintendogs + Cats is one of the most popular games on the 3DS and all too real.
Only livened up if you are allowed to place one of Shirley’s work gloves atop a bottle. 
Any of the Barbie games. If they say “That’s not a 3DS game!” You just say “Oops, I guess not. I’ll go back and buy the right version.”
Extreme Office 3D
This thread reminds me of the Onion parody ad for “World of World of Warcraft” where you played a teenager sitting at a computer in his mom’s basement playing a fantasy MMO.
Oh boy. Oh boy. I think we have a winner. They are even more hostile to “girl stuff” than they are to social studies.
This is getting fun. I’m envisioning “Barbie Visits a History Museum”. But if I do that, the fake packaging will have to look really professional, otherwise they’ll spot the prank right away. I’m hoping to get some serious misery out of them before they fire up the game and see that it’s really Mario Kart.
“Time Out!” The game of punishment. The player has to put the Nintendo 3DS down and sit still and quiet in a corner. The longest to sit still and quiet, wins a chance to do it again.
/Oddly, this has kind of been done on Wii Fit with a candle.
How about instead of Mario Kart 7, you could do a mock up of Barbie Mart 7. (A cutesy Barbie shopping-at-the-mall game.)
Ya know, “Oh, they were sold out of Mario Kart, but I figured this was pretty close. Do you like it?” 