I felt my IQ drop while reading these questions. It hurt.
EDIT:
July 27, 2007
I know not many if anyone will see this, but I understand what he means in Question 3!
Scar threw a shuriken to try to kill Sebastian, but now it's in the room with Lex and Sebastian, with no way of getting back to Scar. Bu then, Scar kills the Facehugger and Alien. Logically, Scar had another Shuriken.
And sorry for the insult.