Holy cow, I wrote a book!
I was filling out one of those online
and in the introduction, it reassured me that
This survey is anonymous.
Enter the support request (SR) number below.
Yeah, because they'll never be able to trace the support
request number back to me.
(I suspect that the reason for this contradiction is that
the organization that wanted to conduct the survey used a site
that supports either anonymous surveys or tracked surveys,
and they opted for
the anonymous survey for whatever reason—maybe it's cheaper?—but
they actually wanted a tracked survey, so they made the tracking
number part of the survey itself.)