Decided to make a list of stuff to get whilst bored...
Discombobulator Ray (not equipped) - turns the target into a leper gnome and reduces movement speed by 20% - probably even works @ Gluth :) The comedy effect of rushing Blacksmiths with friends and turning all enemies there into gnomes is awesome :)
Tidal Charm (trinket) - stuns target for 3s - range is 30 yds! The Prince is never there though :(
Dog Whistle (not equipped) - Provides extra DPS on Patchwerk. Get 40 of them. True reason for all the recent server crashes on Outland :(
Invisibility Potion (not equipped) - or
Lesser Invisibility Potion - don't think there's much difference in the effect except the duration - very nice for ninja'ing into the flagroom or just for those unwanted "boy meets girl" moments (where the boy is an Undead warrior with DEoI who has just popped Battle Stance, the meeting is him spotting me and where the girl is my priest fishing).
Catseye Elixir (not equipped) - in my experience, this is not that good - but it gives you a stealth detection level equivalent to a lvl 62 player which is sometimes enough vs non-NE to break any opener. Worth keeping a couple with you.
Barov Peasant Callers (trinket) - only really funny when there are a very lot of them - 5 for 15 mobs are quite good for confusing people at Blacksmiths also. Also useful in hunter duels to trigger any traps. See also
Cannonball Runner which is quite unfunny unless there are about 5 of them pointing at the flag during the opening zerg @ Blacksmiths.
Chained Essence of Eranikus - 8 yard AOE poison. What could be better than using Chained Essence of Eranikus at an Alterac Valley zerg? Using 5 of them! It stacks, it's beatiful, it keeps a rogue from stealthing for 45s...
Electromagnetic Gigaflux Reactivator (cloth helmet) - Gives you a buff that causes damage to things attacking you - like Thorns - lasts when it's removed too. Good for tanking lots of mobs.
Hydrocane (2H staff) - allows you to breath underwater - see also
Azure Silk Belt - increases swim speed by 15% (I don't know why but I find being underwater quite stressful).
Limited Invulnerability Potion (not equipped) - immune to physical attacks for 6s - surprisingly cheap too since the Chinese hunters started farming herbs in Maraudon.
Skull of Impending Doom (offhand) - deals up 100-500 damage every 5s for 10s. Breaks poly, scatteshot, freezing trap, blind, gouge, seduce. Quest reward. You do not take dura loss from death from this. See also
Crystal of Zin-Malor (trinket) - another self damage item.
Run speed enchant (enchant) - 8% increased run speed - this is the solution to every problem in the game (for old solution, see
Green Whelp Armor) - dying @ Heigan? Get this. Dying @ Thaddius? Get this. Dying in any situation ever, get this.
Flash Bomb (not equipped) - 5 yard AOE fear (10s) on all beasts - works vs druids when in forms. Really easy to farm and make.
Jungle Remedy (not equipped) - sometimes removes disease effects (Devouring Plague) and Poison effects (i.e. Viper Sting) but are incredibly easy to farm. See also
Restorative Potion - removes poison/magic/curse - both share cooldown with HP pots.
Clutch of Foresight (not equipped) - Counterspells an enemy cast preventing them from using that school for 10s - 1 charge only though - surprises the hell out of any healing class.
Bag of Marbles (not equipped) - Decreases target's chance to hit by 25% (10 charges) - you'd be surprised by how many bosses this actually works on and how many of your guild's gnomes/dwarves/NE haven't done this quest from Elwyn Forest. See also
Wail of the Banshee (not equipped).
Snowball (not equipped) - They laughed when I created a bag alt just to store these in. They didn't laugh when they died at the Anubisath mob because they couldn't get away from the explosion. Nor at the frogger mobs past Patchwerk. Or the time that they wiped @ Razorgore because someone hit the controller...
Dartol's Rod of Transformation (not equipped) - Turns you into a furbolg for 3 mins.
And of course,
Noggenfogger Elixir - use of Noggenfogger should be banned at Noth. The slowfall effect is quite nice @ AnubRekhan. See also
Savory Deviate Delight - I miss the old faster casting proc :(
RIP
Large Rope Net (not equipped) - held a target captive for 10s - sadly removed from the game :( How can guilds kill Ragnaros without them :( ?