A couple years I went to the police department building renew my concealed carry permit. I went without a firearm but did have a folding manual knife. Upon entering the building, I dumped the contents of my pockets into the tray and slid it over to the other side of the metal detector. Behind the security area was a row of lots of little lockboxes for stowing handguns and it was marked as such. Guard picked up the knife, opened it, and told me I can't bring it in.
Me: "Err, could you stow it in one of those lock boxes?"
Guard: "No, that's only for guns."
Me: "So, you're saying I can walk in here with a gun, slide it over to you, and you stow it in one of those boxes?"
Guard: "Yes."
Me: "But not a knife?"
Guard: "Right."
Me: "Okay, so... pretend my knife is a gun." (I was trying to fish for a distaste of stupid rules)
Guard: "Can't do that."
Me: "I'm here to renew a carry permit. Are you sure you can't work with me here?"
Guard: "No."
So I sighed and walked back a couple blocks to my car, hid the knife away, and returned. I just thought that was very strange that I could go into a "secure" location with a gun and have it stowed upon entry, but couldn't do the same with a knife.