Naked eye comet.
If comet ISON becomes bright enough to see with the naked eye and I'm able to see it, then that will be the third (naked eye) comet that I have seen in my life time.
Hmm, I did wear glasses the second time that I saw a comet, does that qualify as a "naked eye" comet? :-)
Comet ISON.
http://science.nasa.gov/science-news/science-at-nasa/2013/24apr_hubbleison/