I'm guessing that is a hoax intended to harrass the real owner of the bike with a lot of phone calls.

I remember a great story from my old neighborhood (pre internet days) where a fueding neighbor placed a classified ad in the local paper after christmas, telling people they could dump their christmas trees at so and so an address on a certain day, and to just stack them on the lawn. Guy came home from work to find his whole front yard full of abandoned christmas trees.

The retaliation was classic too, but a bit politically incorrect to tell these days.