I was mining into deeps and went to street sign to go to other street. I used keys to press it. Strangely on enter key it do not activated but growed it bigger. Here is screen:
i56.tinypic.com/2e6d3b4.png
On second enter it teleported me to next street.
Here is normal size one
i51.tinypic.com/atx1y.png
Funny one :)