I'm constantly amazed at how poor the general quality of copyediting on signs and other public displays is. When somebody bothers to pay a signmaker to make several copies of the same sign to be posted in public, don't they copyedit? Or at least ask somebody to take a glance at it?
All of the lifts in the Oxford Centre for Gene Function have the following sign (my emphasis):
In the event of an emergency, press the yellow 'bell' button. You will be connected with Oxford security services who will immediately instigate a rescue operation.
Then there's the whole loose/lose thing, as Anand pointed out.