Thank you everyone who shared your thoughts about the possible ear tip. I can't be sure but I'm going to assume for now that it's an ear tip. I'll keep watching them all and see if I see any signs of any new black cats showing up.
This comic was posted on Meow.com's Facebook page a week or so ago. It fits perfectly for my life! I was a dog person for all my life, up until 2003, when my friends Tom and Sarah introduced me to the amazingness of cats with their three, Elmo, Lucy and Misha.
The expression on the visitor-guy's face is priceless! Some of my non-cat friends have had a very similar look when they come over and experience all the swarming kitties!