Sorry to brining this up but if you're wondering what the answer to this is:

Quote Originally Posted by DarkLord
1.

The ultimate unanswerable question that I know the answer to!

In midgar, after destroying the sector one, mako reactor. What does the Avalanche graffiti say on one of the walls. (you can't see it, find out some other way).

it is:

Don't be fooled by Shinra!
Mako energy doesn't last forever!
Mako is the Planet's life source!
The end is in sight!

Protectors of the Planet: AVALANCHE

that question was a little cheap because you actually had to remember what the guy said after leaving the reactor during the bombing misson...