I'd love to make an alarm that has huge speakers outside that go off if a prowler is around. Rather than a siren it'd be great if it were an enraged male voice spouting vehement expletives.
"F@#K!!!! You f*#king f#@k, how dare you try and break in here. You worthless son of a mangy f#@k. I'm gonna shoot you. I'm gonna blow you away and then I'm going to make you kiss my a$$ you dumb f#@k!"
or
"FREEZE MUTHA FLUFFA!"
In terms of volume think as loud as a really loud band. Yes it will disturb the neighbours, Isn't that the point?
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I am the walrus!.... er, no hang on....
A fair dinkum laughing Hyena!