Bloomin thieves
I left my Diamondback BMX in my friends garden as a kid for an hour with no locks on at all, when I came out I no longer owned a bike. Never not locked one up now, even when I visit my friends cafe and sit outside near it I lock it up.
I had 5 of these and no other type of lock chaining 2 motorcycles together and to a ground anchor. When I got up one morning all 5 locks were present on the ground and locked again but there were no motorcycles. I did get one of the bikes back and compensated for the other one, best to not go into details on here but I dragged one of the thieves back to my place to show me how he had done it. Those locks were £70 each too, so yeah I wont use them again either but maybe they now have a fix. There were 3 thieves all ended up very very sore and out of pocket, all druggies, 2 are dead now just waiting for the last one to pop off.