I don't see a lot of humorous anthologies around (that doesn't mean they don't exist, just that I don't see them). This collection, featuring stories by Robert Silverberg, Mike Resnick, Ken Liu, Esther Friesner, Tim Pratt, and Jody Lynn Nye, looks great:
We’re looking for speculative stories with a strong humor element. Think Resnick and Sheckley, Fredric Brown and Douglas Adams. We welcome quality flash fiction and non-traditional narratives. Take chances, try something new, just make sure that your story is funny.
Puns and stories that are little more than vehicles for delivering a punch line at the end aren’t likely to win us over.
They're after 500-6,000 word stories, and are paying $0.05 cents per word as well as a contributor copy.
Note: you need to remove your name from the manuscript, as they will be reading submissions blind.
If your story is rejected before May 31 you may send another, but we will only consider up to two submissions per author. If your second submission is rejected, we will ask you to wait until next year, when we’re reading for UFO3.
Check it out here: http://alexshvartsman.com/ufo-unidentified-funny-objects/