So, you know this Secret Invasion story going on in Marvel Comics at the moment? It's a story about a group of shape-shifting aliens called Skrulls who are trying to take over the world by secretly replacing various heroes, villains, babies and butlers over a period of years until they're practically running the world before anyone even knows they're here.
Two issues ago, Reed Richards invented some kind of deus ex maguffinica that shoots a beam at the ground and reveals all disguised Skrulls as Skrulls. In the latest issue, Reed turns it on the bulk of the Skrull army (who, fighting a 21st century interplanetary war, have decided to emulate the 18th century style of formal warfare, and amass all of their soldiers in one place to fight all of their enemy's soldier).
Once Reed's Skrull Revealer is activated, the Skrulls all go green, and their wrinkly chins and pointy ears appear, although most are still wearing superhero or supervillain costumes, so either they're wearing real costumes (instead of just shapeshifting them on) or the Skrull-shower only affects the area between the chin and ears.
The sixth issue ends with a double-page spread of all the real superheroes and supervillains fighting all the Skrulls (which might have been an exciting last panel, if it weren't immediately preceded by another double-page spread). In the background, we see this Skrull: Apparently, there was a Skrull disguised as Galactus, I guess. That has got to be the absolute worst Skrull disguise. Galactus is, of course, a god-like being who travels the universe looking for planets to eat and, when he usually visits Earth, it's to destroy it. So, not a very good person to dress up as when trying to secretly infiltrate Earth; chances are, all the heroes are going to confront you as soon as they see you anyway. It would be a little like if someone were trying to infiltrate Britain in the mid-1940s and decided to disguise themselve as Hitler. A giant Hitler.
Anyway, that Skrull got screwed when they were doling out disguise assignments.