Au     區   "Ow!" for sudden pain
Yau   邱   "Yow!" for sudden pain
                  (especially by burning)
Wu    胡   "Woo!" on seeing fireworks
Ng     吳   "Mm!" for agreement, a pleasant
                 flavour, or comfort
Ho     何   "Hoh!" to express something hot
                 in the mouth that can't be spat out
Ga     賈    "Gah!" when being strangled
Ha     夏    "Hah!" on discovering a secret or foiling a plot
Fu     傅    "Foo!" when sitting down after a long day
Lo     盧    "Lo!" to draw attention to something,
                  as in "Lo! He comes with clouds descending..."

1) The Shining (Jack Torrance)
2) Batman (Jack Napier)

NB: In Chinatown his character was named Jake Gittes.