Good morning friends I trust we all are doing okay this bright Friday?

Random thought just for fun since today is TGIF:

Why is it that when one key opens so many padlocks it is called master key but when many keys open one padlocks, the padlock is bad and needs a replacement.?

Just getting to see this,but if all I must be very honest with you that this is a very tricky one from you and I will be lying if I didn't admit that u don't have a very good or clear answer on that mate