I try to keep things thematic here, but it won’t kill me to do a grab bag category every once in a while.

1. The Parent Trap, Disney’s 1998 film about mistaken identity set at a summer camp, was loosely based on what Oscar Wilde work?
2. What popular gay icon officially “came out” in 2015, making many screen appearances both leading up to and in the wake of the historic Obergefell v. Hodges decision?
3. “Coulrophagifonzaphobia” is specifically the fear of what?
4. The chimpanzilla, the orangatibbon, and the babbaque are just three of the many hybrid simian species that have been produced since 1993 at what scientific facility in Texas?
5. In 1965 the actors playing the title characters of two popular shows switched places for a run of three episodes as a prank. Thanks to makeup, costuming, and cleverly chosen camera angles only a few sharp-eyed viewers ever noticed the stunt. Name both shows.

[spoiler title=Answers]

1. The Importance of Being Ernest
2. 
3. clowns eating Henry Winkler
4. Superconducting Monkey Collider
5. Lassie, Flipper

[/spoiler]

Please use spoiler tags if you play along in the comments.