Type in "thedus"
Also "LV-426" (dash required)
I remember some debate about whether LV-223 was orbiting the same plant as lv 426. Typing in "LV-223" yields same response... could be that it's registering lv-223 as the same entry (error) or maybe it's confirming that they are orbiting the same planet...
Oh! And type in "colonial marines" I found the response humorous! :-)
And... I also got responses for hammerpede, chestburster, facehugger, and ovomorph...