This has been floating around the net for a while, however I only first saw it yesterday.
Apparently lemons in restaurants are covered in bacteria.
Now that's not in and of itself a surprise as pretty much everything is covered in bacteria, but the fecal bacteria, those I'd rather avoid.
Watch the video and decide for yourself.
Me? I think I may forgo the lemons.
[Hat tip to my friend and colleague Hillel]