In last Sunday's Chicago Tribune, the comics section had not one, not two, but three different comics about UFOs and extraterrestrials.
One was Brewster Rockit:
Another was Bound and Gagged:
And finally was Dogs of C-Kennel:
I guess this was just coincidence. I did a quick check to see if May 18th was some sort of national UFO day, but didn't find anything.
Brewster Rockit is quite funny and has quickly become my favorite comic since I subscribed to the Tribune (see my Newspapers blog post if you need a refresher). It's sort of retro sci-fi that Wikipedia describes as "the misadventures of the dim-witted Brewster Rockit, captain of the space station R.U. Sirius, and his crew."
A few weeks ago it had an even funnier comic about alien abduction:
Check it out if you get a chance!