I love how people refuse to sign them.
When I was in ops management, every now and then someone would refuse. I would respectfully ask them why they wouldn't -I certainly couldn't make them sign- out of sincere curiosity. It boiled down to either they thought that it didn't count if they didn't sign (which isn't true) or some silly attempt to exercise power (like a bald man fighting over a comb).
I thanked them for their honesty, called in another ops manager, had them verify that the OLCC was presented to and explained to the employee, and that the employee refused to acknowledge.
So glad to be away from that stupid

.