Originally Posted by
Sixty Fiver
Cutting through a frame with a hacksaw takes no time at all and have heard of cases where thieves have locked up people's bikes so that they'd leave them and then gave the thief all the time they needed to steal it.
If I find an other bike locked to mine I will do what I have to in order to free my bike.
There's also the social engineering version of this.
Target bike in private/commercial bike rack, put your own lock on it.
Find a security guard that belongs to the area and notify them that someone has locked your bike with their own lock, explain that this is a common way of stealing bikes.
Unlock your lock to prove the bike is yours.
Security guard grabs bolt cutters and cuts the actual owner's lock.