Just remembered a story my Dad told me about a man who was determined to beat the thieves. On a trip to Brussels by jeep he took with him a heavy duty chain and lock. After he parked up, he wrapped the chain around a rather substantial tree and threaded the chain through the steering wheel before locking it tight. He then left to enjoy his day. Upon his return he found the chain still around the tree and threaded through the steering wheel. But the jeep was gone.