get people who play shooters and put them in an enders game situation. if you do not know what i mean by this it goes along the lines of this(hiwever this will spoil the book/movie)
spoiler: i will put a "x" between each letter to try and make it less readable
exnxdxexr ixs txrxixcxkxexd ixnxtxo txhxixnxkxixnxg txhxaxt txhxe rxexaxl bxaxtxtxlxe ixs a sxixmxuxlxaxtxixoxn