If you really did work there, what you remember and what actually happened are two completely different things. You probably showed up to work every day high off of something. The engineers knew this and as a joke would go and ask your opinion about something related to their job. What you thought was coming out of your mouth was the most intelligent, life-changing information ever spoken. What the engineers heard was the most incoherent, retarded excuse for the English language ever spoken. They got their laughs, told you that you were doing a good job, and that they'd give you credit for the information you provided so they could keep on getting their laughs. You weren't sober enough to realize you were the butt of their jokes.
Of course, you could completely put this to rest by posting up the project information that shows your name in the credits.