Yes, yet another mod which plays sound clips and gets others in your party/guild who also have the mod installed to play them at the same time. This started as a guild joke project, but I've put a bit of engineering into it so thought I would release it to the wild.

Current sounds: You're the best...around, Eye of the Tiger x 2, Llama song x 2, bananaphone, firemaw chant, some Aliens sounds, some MP and the Holy Grail sounds, failure to communicate, crickets (inside joke), Benny Hill x 2, leeroy, thundercats, he-man, bringoutyourdead, repressed, violence inherent in the system, spam, deliverance (dueling banjos), A-team sounds, top gun sounds, khaaan!, bowie, jackass, zombo.com, S.U.N., Macho Man, All your Base, spaceballs, the tick, fast times, rickroll, tase, tunak, tunak2, desert, conan, chumba, ghostbusters, llcoolj, ufoporno, better off dead.

to use, type: "/rsa [sound]", for example "/rsa llama"
for the list of all available sounds (and other commands), type: "/rsa"

other options: load (enable|disable), raid (enable|disable), death (enable|disable)
also, specific sounds can be enabled or disabled.

e.g. to disable, type "/rsa load disable"
to disable only during raids, type "/rsa raid disable"
to disable the death sound, type "/rsa death disable"
to disable a specific sound (say, the llama sound), type "/rsa llama disable"

Idea and some sounds stolen shamelessly from http://www.curse-gaming.com/en/wow/addons-1930-1-leeroyhillcatspower.html , but I've more or less completely rewritten it.