This day I was
the bug.
I spent a Friday
afternoon bolting a pair of 58 GHz microwave radios in place as the
building was getting a new sign installed.
The sign guys were real nice and helpful. They loaned me a tool
and helped stretch out some cable. I left about 4 PM and they
were a little over halfway done.
I showed up at the other end of the link on Saturday morning and
noticed the sign was complete. I also noticed that the lower case
"l" in the sign was in
about the right place to block my radio path.
So I finally get back to look at the situation first hand and it's even
funnier than I thought. The alignment is almost perfect.

What boggles my mind is that the lower radio has a link at all. It's
completely obscured by the flag on the top of the "l" and yet has a link
that's only 20 dB worse than the unobscured radio. Some friends
indicated they thought this was about right. I figured at least 30 dB,
and probably more like 40 dB for sidelobes and scattering loss.