On 28/11/2012 12:09, usenet2012 wrote:

At our local Sainsbury's the guy who returns the parked trolleys to the
front of store uses a metal knife to push the connecting pins out. I've
never been tempted to try the technique, partly due to never having
found a need to carry such a knife in public and partly due to the
quantity of fellow shoppers and CCTVs.


They make special tools to do that, are you sure its a knife?