The Aslan have two types of laughter: the polite laugh, which is a small
but definitely audible hissing through the teeth, and the familiar laugh,
which is a full-throated, teeth-gleaming yowl (usable only among close
friends). Humans have many types of laughter, widely variant with respect
to culture; the same is true of most other races, except the K'Kree,
whose laughter is unrecognizable as such by other sophonts, and the Hivers,
who don't laugh at all.
The Vargr, on the other hand, have one universal truth: if you're gonna
laugh, don't piddle around-- LAUGH! As a result, a Vargr having a good time
can be a bit jarring; MANY Vargr having a good time can be earsplitting.
"HARF HARF HARF!"