Or carry a couple of guard dogs in your saddle bags, pop the latches when you walk away. Voila!
I used to drive around in a Jeep CJ in Texas when I was younger and had a Doberman that would lay down behind the front seats...you couldn't see him until you got right up on the side, then he would stand up...seen some pretty funny reactions over the years. I could have left a bag of money in there and it would have still been there when I got back...loved that dog
5 different ways to keep your bike from being stolen (why does the original link go to ebay)
To make your bike less attractive to being stolen (nothing will stop them if they truly want it)
Put a flashing red LED somewhere prominent on your bike. Thieves are lazy, and look for low risk opportunities. (I have a friend that does this)
Bring a phony camera on a magnetic mount, a stick, and park next to a light standard. Put the phony camera on the light standard using the stick and magnetic mount (ditto, friend did this in the garage where he parks)
Carry a bottle of used oil, squirt it directly under your bike where you park and a little on the engine casing to add the 'drip effect
Carry a bottle of Skunk scent, spray the ground directly around your bike but make sure you don't actually get any on your bike.
Put it under a harley cover, but make sure you have a hells angels patch in a prominent place. HDs are everywhere and the thief will look for one that is less risky
Cover up the BMW emblems with Moto Guzzi emblems. Nobody wants that repair hassle.