Google's John Mueller posted on Google+ a hint and reminder about the problems with not thinking too far ahead. In short, one web site dislike's Apple on a lot of levels and decided to protest by blocking any Apple device from accessing the site.
The message Apple users saw on the site was "Apple devices not welcome" followed by an explanation of on why. Here is a picture from John:
Now, John said "Guess how Googlebot for smartphones sees this page ... :-/"
The answer is, GoogleBot for Smartphone has a UserAgent that acts as an iPhone user.
Mozilla/5.0 (iPhone; CPU iPhone OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5376e Safari/8536.25 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
So not only do Apple users see this but anyone searching Google on their smartphones.
It appears this webmaster removed the block and this is no longer showing up, but I suspect it led to indexing issues and the webmaster decided to pull down his/her protest.
Forum discussion at Google+.
Note: I am offline today and this post was pre-scheduled to be automatically posted. So if I am delayed in responding to issues or comments, I apologize in advance.