Stupidity Detector

The Stupidity Detector is an invention Kanako claimed that Kaolla invented to check if someone is stupid, and pretended to use it on Naru to ruin her Self-confidence, but Naru saw that it was just Kanako's Ventriloquism and no real invention

Items and Terminology
Weapons and Abilities	Fencing • Kendo • Shinmei-ryu • Jeet Kune Do • Urashima Style of Jujutsu • Pa Ki Ken Living Souls Exchange • Naru Punch • Rock Splitting Sword • Rock Splitting Spirit Sword Anti-Naru Laser • Compliant Rod • Harisen • Hina Blade • Mecha-Tama • Mr Merkaba • Onmyōdō Charms • Proton Packs‎ • RoboKentaro‎ • RoboShirai and RoboHaitani‎ • Shisui • Toy Tanks‎ • Watermelon Smoke Bomb

Transportation	Amallan Kaollan • Kaolla's Air Balloon • Kentaro's Car • Kentaro’s Vehicle • Mecha-Tama 3 (anime) • Mecha-Tama 4 (manga) • Seta's Van • Seta 02 • Shinkansen • Tram • Yamanote Line

Kaolla's Inventions	All Seeing Light‎ • Anti-Naru Laser • Countdown Clock • Hot Springs Radar • Kaolla's Air Balloon • Mecha Keitaro • Mecha-Sarah • Mecha-Tama • Mr Cherry‎ • Mr Cherry Ver 2‎ • Mr Merkaba • Mr Shankara • Mr Virtual‎ • Naru Radar • Proton Packs‎ • RoboKentaro‎ • RoboShirai and RoboHaitani‎ • Shinobu's Rabbit • Stealth Suit • Stupidity Detector • Toy Tanks‎ • Turtle Radar‎

Fashion	Ahoge • Burglar Mask • Cosplay • Dotera • French Maid Uniform • Fundoshi • Gothic Lolita Fashion • Hakama • Impersonation • Kimono • Leaf Bikini • Lingerie • Naked Apron • Playboy Bunny Suit • Sarashi • School Uniform • Shampoo Hat • Swimsuit • Underwear • Wedding Dress • Yukata

Food	Bananas • Beef Bowl • Chinsuko • Cooking • Cup Noodles • Dried Squid • Genki Drinks • Habushu • Hiyayakko • Homemade Cookies • Marshmallow Peeps • Miso • Oden • Okonomiyaki • Onigiri • Soba Noodles • Sweet Potato • Takoyaki • Warabimochi • Watermelon

Terms and Concepts	ABCD • Blood Type • Bondage • BWH Measurements • Chanbara Film • Chikan • Exams • Fanservice • Japanese Bathing • Kissing • Magical Girl • Marriage • Pillow Fight • Pop Idol • Romance Novel • Ronin • Samurai • Sash Pull • Seiza • Seppuku • Watermelon Smash

Other	Adult Magazine • Arcade Videogame • Archaeology • Bowling • Buddhism • Cherry Blossom • Dogū • Dreamcast • Ema • Engagement Ring • Futon • Godzilla • Eastern Role-play Videogame • Haiku • Haunted House • Hostess Club • Izakaya Restaurant • Journey to the West • Kamidana • Kanako's Favourite Picture • Karaoke • Keitaro's Diary • Keitaro's Mechanicle Pencil • Keitaro's Sketchbook • Kotatsu • Liddo-kun • Love-Love Degree Graph • Manga • Molmol Vase • Naru's Jacket • Naru's Pendant • Naru's Watch • Nyamo's Locket • Omikuji • Onsen • Personality Chart • Phone Card • PlayStation 2 • Preparatory School • Print Club • Red Moon • Rock-Paper-Scissors • Shiisaa • Shinobu's Doll • Shinto • Shishimai • Shishi-odoshi • Shooting Gallery • Special Urashima Gift Certificates • Super Sentai • Table Tennis • Taro Urashima • Tennis • Turtle Civilization • Turtlese • UFO Catcher Doll • Umbrella of Togetherness • Vending Machine • Videogame Console‎ • Wedding Bouquet • Yatai • Yen