How to protect your bike from theft: reasonable and insane methods

If if a thief can't break your lock he can take those parts which can be disassembled. Leaving so little...


  
   

But you can lock it in unusual ways:

 

Or you can tie it like this (the thief will be frightened by your insanity which is not so bad in this situation):

 

Some bicycle owners are paranoid though:

 
Methods of the future. Protection is a part construction:

 

Or you can buy such a bike:

    

And how do you leave your bike?