On Talk Like a Pirate Day I(September 19, 2008, Greenday, 6th Mork 2011), Pirate chat effect were active.
Words getting replaced:
You=ye
your=yer
Moolah=doubloons (yarrrr)
Special chat messages at the end of your messages:
Yo ho ho!
Matey!
Splice the mainbrace!
Yarrrrr!
Me hearties!
Landlubber!
Shiver me timbers!
Ye saucy wench!
Chat admins/Mod and Users got special figures in chat.
Admins/Mods- 
Other Users- 