Regarding the stormtrooper, Catbus, I heartily agree with you. My words weren't directed at your viewpoint, but at the viewpoint that insists that it's a flaw with the movie. Things that are funny happen in real life all the time.
Our viewpoints are complimentary, not contradictory. You were talking about whether or not it's funny, and for that it doesn't really matter if it's realistic or not, like you said.
But I was talking about whether or not a faneditor with the goal of fixing "flaws" in Star Wars could leave the stormtrooper shot alone on the basis that it could actually happen, so for my point it does matter if it's realistic. That doesn't conflict with seeing it as funny.
What makes me put the shirt-color-change in a different category than the stormtrooper headbump is the potential for actually happening. But could they both get a laugh? Sure.