There are lots of spells and items that change chatting.
Spells
Silvertounge
Frog
Silence
Items
Bottle of Liquid Dutch
Bottle of Liquid French
(and one or two other of those...)
Windy's Endless Supply of Beer
And a nice addition would be the Leet Speak Spell
Example-
[Spell]:y0u 15 U83R - aaront222
aaront222:h3110 p33p5 (hi people)
aaront222:900D j08 y0u !5 1337 (good job you are leet)
alphabet (english a to z)
4, 8, (, D, 3, F, 9, 4, !, J, K, 1 M, N, 0 (that's a zero), P, ?, R, 5, 7, U, V, W, X, Y, Z
The alphabet is incomplete mainly because although SOME of the letters can be represented by combonations of characters (eg |\| for N, [) for D)it would look really messy and just make lots of chatting look really weird.
Method for obtaining-
Wish Shop?
An ingame puzzle...?
A present you can find under the tree at GoE...?
Mur deciding to be generous
Someone gets item "Elite Potion" description "If someone drinks this potion they will become 1337"
What do you think?