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Weapon/object duality is a game concept that is a feature, often mistaken as a glitch, in Problem Sleuth whereby all weapons have an innocuous double, switching back and forth between the two forms seemingly at random. Interestingly, the object and the weapon may have large differences in their degree of encumbrance. Bizarrely, they often do not, the hairpin being heavy enough to break the glass in the skylight. Pumpkins also seem to have this effect in Jailbreak, though their innocuous double is nothing (or air).
Originally, the effect would be triggered whenever the object was named (You would have a Gun if you called it a Key, and vice-versa). This later changed to whatever was funnier at the moment.
During the Midnight Crew Intermission, Clubs Deuce acknowledges this gag by mentioning how he can never remember which one of his weapon/object "cards" to pick up. It appears that every card will have a double. Furthermore, when Spades Slick takes out his deck of cards, it appears as a large spiked chest instead. Interestingly, the chest contains some of his possessions... including another deck of cards.
In Homestuck, Kanaya Maryam has a Chainsaw/Lipstick, but it appears to collapse or expand mechanically from one object into the other. This oddly achieves the same effect as the duality seen in Problem Sleuth without any "glitch" occurring. Her chainsaw/lipstick appears to be designed to transform rather than doing so for no apparent reason such as in Problem Sleuth and the Midnight Crew Intermission.
Lord English's staff switching to an assault rifle.
Later on in Homestuck: Intermission 2 it's revealed that Lord English's CAIRO OVERCOAT turns into an Egyptian Sarcophagus, which is a play on gangster slang for coffin: "Chicago Overcoat".
After the scratch in Homestuck, Jane Crocker also owns a spoon that on 11/11/11 11:11 switches into a fork, and from then on is able to switch between the spoon and the fork.
Calliope has a white wand
that is the innocuous double of her magnum. She notes that Caliborn has a similar but more heavy-handed weapon, which later turns out to be a scepter/machine gun.
Problem Sleuth | |
| Innocuous Double | Weapon |
| Key | Handgun |
| Ring of keys | Tommy Gun |
| Hairpin | Machinegun |
| Teddy Bear | Knife |
| Paint Roller | Stun gun |
| Paint Stripper | Flame Thrower |
| Sextant | Sniper Rifle |
| Megaton Key | Brass Knuckles |
| Blond wig | Prussian Kuirassier Helmet |
| Romance Novel | 2 by 4 |
| Chocolates | Bandolier of Grenades |
| Lipstick | Chainsaw |
| Everything | Scythe |
| Tectrix of the Arbitor | Tectrixcalibur |
| Ink of Squid Pro Quo | Scabbard of Tectrixcalibur |
| Typewriter | Smith Corona Blotspitter |
| Semigoddess' hairpin | Ribbon Cartridge |
| Gay pornography | Fork |
| Skeleton Brush | Skeleton key |
Homestuck | |
| Kanaya Maryam's Lipstick | Chainsaw |
| Egyptian Sarcophagus | Cairo Overcoat |
| Lord English's Assault Rifle | Golden Cuestaff |
| Calliope's magnum | White Wand |
| Caliborn's assault rifle | |
| Biscuits' oven (with the Felt including Ms. Paint, plus Aurthour inside) | Thirteen of Stars Card |
Midnight Crew Intermission | |
| Deck of Cards | War Chest/Battledrobe/Brawlsoleum/Wrathtub |
| Ace of Spades | Cast Iron Horse Hitcher |
| King of Spades | Occam's razor |
| Eight of Spades | Double Edged Sword |
| Four of Spades | Saber Rattle |
| Seven of Spades | Bait and Switchblade |
| Instructions of Playing Blackjack | Spades Key |
| Deuce of Spades | Licorice Scotty Dogs |
| Deuce of Clubs | Licorice Gummy Bears |
| Deuce of Diamonds | Swedish Fish |
| Deuce of Hearts | Wax Lips |
| Ten of Spades and Four of Diamonds | Radio |
| Seven of Spades | Demolition C4 |
| Jack of Diamonds | CD's Backup Hat |
| Snowman's cigarette holder | Lance |