Like your choices for Lain and Evangelion?
The character ones (including the giant robots as characters) are generally easy, even for shows one's not seen -- of those, the ones most likely to rate as tricky would be the "Which Gundam are you talking about here, or is it the whole franchise?" That's not to say that there aren't any where I go "I don't know these people."
The other ones are actually more interesting when they show what each person thinks is iconic of a series, like the pink room which I cannot identify in TDK's.
The only one of mine that has yet to be mentioned is the NGE replacement with Mushishi (a vignette from a scene in the first episode showing a mushi in action, rather than yet another picture of Ginko looking mysterious).
@Director Black : 5/5
@A.T. Fish : 4/4
@bobbyfischer's ghost : 1/2