this may be a little extreme but
"DO NOT LEAVE ANY BIKE UNATTENDED THAT YOU DONT WANT STOLEN!"
If you do have to use a bike for transportation and leave it locked up for long periods of time, buy a $100 POS on craigslist, make it functionally perfect, ride it until someone steals it, start over. Sorry.
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2010 Kestrel RT900SL, 800k carbon, chorus/record, speedplay, zonda
2000 litespeed Unicoi Ti, XTR,XT, Campy crank, time atac, carbon forks