riot, belly laugh, scream, thigh-slapper, howler, sidesplitter, floor, marvel, blow someone's mind, knock, more...

yawn

pow, bow, big, annual, double, grand, indian, chow, perfect, grim, nice

"very impressive!",   express excitement,   impress others,   oh my,   "i'm impressed!",   said in surprise,   oh boy,   goodness me,   i'm impressed,   "that's amazing!",   that's a surprise,   sound of amazement