Only backwards
You can’t write that down, she tells me. Or everybody will know. But I do it anyway; Write it down in big fat Sharpie (R? TM?) Permanent Marker on the vestibule (? Maybe just a hall?) wall. And I sign it in only slightly smaller characters, with that disctinctive half-cursive SCO combination I hate but have resigned myself to accepting as my signature.
For good measure, I add my phone number. Only backwards.