I think this question has been asked so many times and yet still open for further discussion and debat...
So who shot first?
Greedo or Han Solo?
In origin theatrical version, Han Solo was spotted to shot first. However later in Special Edition re-release, Greedo was said he's got the first shot. Later in the DVD Special Edition box set, both characters were said they had a precise timing of shooting at each other at the same time...
What's your view?