Nostalgic game themes:

mario.swf - sound required (dialog, music) * brief language (verbal)
humor_pong.swf - sound optional (effects) * language (written)
zelda.swf - sound optional (music, effects) * situations
workit.swf - sound required (music)

Stuff with a point to it:

switchlinux4.swf - sound required (monolog)
fight.swf - sound recommended (effects) * violence
xiaoxiao5.swf - sound recommended (effects) * violence
xiaoxiao7.swf - sound recommended (effects) * violence
warning.swf - sound optional (music)
nojob.swf - sound required (monolog)
naukajazdy.swf - sound optional (music, effects)

Then there's just stuff (things that make you go wtf):

pika.swf - sound required (music)
dengdeng.swf - sound required (effects)
weee.swf - sound required (music) * brief language (verbal, written)
jada.swf - sound required (music)
endofworld.swf - sound required (dialog) * language (verbal, written)

Finally, these are at least partially interactive:

xiaoxiao4.swf - sound recommended (effects)
pacman.swf - sound recommended (music, effects)
duckhunt.swf - sound optional (music, effects)
winrg.swf - sound optional (effects)