Lindsay Lohan got SERVED with a lawsuit on her way into court this morning ... by an apparently delusional man who believes he played a role in the killing of Osama bin Laden.
TMZ has obtained a copy of the suit, filed in L.A. County Superior Court ... which is essentially 12 pages of incomplete, incoherent gibberish.
It appears Green feels he was duped ... and when he pressed Lohan about her true intentions, he uncovered a conspiracy about the killing of Bin Laden.
In his suit, Green writes, "[Thomas] set out to command [Lohan] to twitter and stated if [Lohan] acknowledges this is an Osoma Bin Ladden op all civilians in past wrong doing will receive clemency."
Green also claims he is a former U.S. Marine -- who recently spent time in a homeless shelter due to a "depreciated stage of delusion and hallucinations."
Then, for no apparent reason, he writes, "[Lohan] might be a high end prostitute."
Green is suing Lohan for engaging in unfair business practices -- and he's demanding $300,000.
But as crazy as his lawsuit seems, Green hired a process server ... who served Lindsay at her progress hearing in L.A. this morning.
So, stay tuned ...