Duane Rimel's "The Jewels of Charlotte" - a nice bit of weird that doesn't feel it has to come up with a turgid explanation.
Obviously can't argue with Borges "There are More Things"
Randall Garrett's twist ending in "The Horror out of Time" allllllmost works, and gets an E for effort.
The first 90% of David Kaufman's "John Lehmann Alone" has great atmosphere of increasing dread, but I just don't like the resolution. This would have benefitted from even less attempt at explanation.