Ways not to lock your bike

I was on the lookout for terrible locking up on the way to work, saw a MTB locked on the stem and a rusty old triumph (I think) locked under the saddle.

I saw a terrible lock technique on the way in today. Bike was just stationary in the middle of the road with no lock or chain or nuffin. I was about to tell the owner what an awful job they had done but they cycled off on it when the lights went green.