Casada's Sword of Capitalism
This appears to be a normal +2 Longsword. However, whenever the bearer is fighting any enemies with an INT score of 6 or more who appear to using low quality weapons or armour, the sword will try to possess the wearer. They will continue fighting, but will constantly shout the merits of Casada's Magic Armoury, where you can get The Best Magic Items at Low Low Prices. Also, the user will deal nonlethal damage to such enemies and cast Invisibility on their loot when they're being searched (poor, dead people make poor customers, after all)
Gauntlet of Temporal Displacement
This psionic item is a normal +2 Impact Gauntlet. Once per week, it can use a special attack. If it hits, it knocks the enemy into the middle of next week. If their space is occupied by a solid object at that time next week, they appear in the closest safe spot.
A variant is the Gauntlet of Fecal Dislocation, where the special attack can be used to beat the crap out of an opponent. They gain a +4 enhancement bonus to INT & WIS for 1 hour, as they are no longer full of crap.
An artifact version is the Gauntlet of Metaphysical Translation, which can knock the target right out of the d20 system. Stats for them in another RPG system must be rolled up before the fight can continue, probably in a very confused manner.
Red Pen of Supersonic Travel
Once per day, this pen can be used to activate a Greater Teleport effect. This is accomplished by using the pen to draw a red line across a map from the current destination to the intended destination. (see any Indiana Jones movie for a demonstration)
Hat of d02
The command word is "Know no limit." Nuff said.
Crowbar of Freeman
A +5 Evil Outsider Bane Club, the reason behind the strange design of this weapon is anyone's guess.
Belt of Narrative Provision
When worn by a character with the Improved Unarmed Strike feat, this item will cause a large bubble with "Whammo!" "Kapow!" "Blam!" or the like to appear in the air whenever the character hits someone with an unarmed attack.
Sword of Psionic Attraction
This is a normal magic sword that has been treated to be psionically attractive. The only effect that this have is that when a psychic anywhere in the multiverse manifests Call Weaponry, they're especially likely to get this sword. It spends maybe 1% of it's existence in the hands of it's owner.
Figurine of Wondrous Power: Energised Rabbit
When activated, this figure will transform into a normal bunny, which will run off in the indicated direction, and will keep going and going and going, indefinately. Since the owner can't tell it when to stop or get it to go anything other than set off, it's of limited use. The command word will change it back into figurine form, though that will usually involve waiting for it to circumnavigate the globe.