Two topics with "Rhaa" have left me wondering what other words might be out there in other languages and cultures.
I've seen Canadians use "pfft" as, I guess, a dismissive.
In Brazil I saw a comic book where a grenade went "pom!" when it exploded. Hey our US grenades at least go "kaboom" or some other manly sound, but "pom?"
Bells, in the US will go "ding dong" or "clang" if they are off key. How about in your part of the world?