the most cracked out game i ever played in a HK arcade was this typing game (i think from the same producers as house of the dead).. see the link below.. instead of shooting a fake gun, you basically have to type words to kill the zombies. I remember once you get to some of the harder levels, there weren't even words, just random letter combinations..
im sure some of you 141 bros would rock this game with your 50,000 words per minute typing skills
http://en.wikipedia.org/wiki/The_Typing_of_the_Dead