Search the web for sounds.
Examples:
beep ,buzz ,cartoon noises ,chirp ,clap ,click ,creak ,crunch ,cut ,electric current ,electric sparks ,growl ,hiss ,howl ,knock ,metal ,noise ,pop ,rattle ,rip ,roar ,robot ,scrape ,scratch ,screech ,skid ,snap ,splash ,splat ,spring ,squeak ,squeal ,static ,steam ,stone ,wood.Just came across this again.
Cool.