Buffy the Vampire Slayer Season 10 #19 (published by Dark Horse Comics in September 2015, titled "Freaky Giles Day")
Features a brilliant parody cover styled after John Byrne's iconic cover for The Incredible Hulk #340 (which famously featured Wolverine reflected in the Hulk's massive silhouette)
Issue Details: Title: "Freaky Giles Day" (Part 1 of a storyline referencing Freaky Friday)
Creators: Written by Christos Gage and Nicholas Brendon, with art by Rebekah Isaacs.
Plot: Willow performs a temporary spell to turn young/teenage Rupert Giles back into an adult, leading to chaotic monster trouble while Buffy and Dawn deal with their own reunions.