Some of the ones I have in my collection are:

RESTROOM with a small sign right next to it saying KEEP OUT by order of the Sherrif's Dept.
This combination was seen on a public restroom at a local flea market.

My other favorite was seen at the local bank drivethru:

For the convenience of our customers, counter documents may no longer be obtained through the drive thrus.

This basically tells me thah for MY convenience, if I need a counter document such as a withdrawal or deposit slip I must park my vehicle, go into the bank and demand such an item. This makes it more convenient??? Ah yes, it's a strange, strange world we live in, Master Jack.....