Not quite a lie, but asking a question that you don't really need the answer too.... One I've used in the past....
"ABC, report your shoe size"
Just wanted the pilot to say something so I could get a reading on the VDF (VHF Direction Finder) so that I could get him in sight.
"Report your birthdate", "...mother's maiden name", "...uncle's address", "...bra size" all work well too.
Usually followed by a "Errrr, say again tower?" and that works just great!!!