Possibly the dumbest script ever. Why make this gist public? Why not, I ask you, why not?

downunder.rb

#!/usr/bin/ruby

input = STDIN.read

subs = {
	" " => " ",
	"a" => "ɐ",
	"b" => "q",
	"c" => "ɔ",
	"d" => "p",
	"e" => "ǝ",
	"f" => "ɟ",
	"g" => "ƃ",
	"h" => "ɥ",
	"i" => "ı",
	"j" => "ɾ",
	"k" => "ʞ",
	"l" => "l",
	"m" => "ɯ",
	"n" => "u",
	"o" => "o",
	"p" => "d",
	"q" => "b",
	"r" => "ɹ",
	"s" => "s",
	"t" => "ʇ",
	"u" => "n",
	"v" => "ʌ",
	"w" => "ʍ",
	"x" => "x",
	"y" => "ʎ",
	"z" => "z",
	"A" => "∀",
	"B" => "q",
	"C" => "Ɔ",
	"D" => "p",
	"E" => "Ǝ",
	"F" => "Ⅎ",
	"G" => "פ",
	"H" => "H",
	"I" => "I",
	"J" => "ſ",
	"K" => "ʞ",
	"L" => "˥",
	"M" => "W",
	"N" => "N",
	"O" => "O",
	"P" => "Ԁ",
	"Q" => "Q",
	"R" => "ɹ",
	"S" => "S",
	"T" => "┴",
	"U" => "∩",
	"V" => "Λ",
	"W" => "M",
	"X" => "X",
	"Y" => "⅄",
	"Z" => "Z",
	"," => "'",
	"!" => "¡",
	"?" => "¿",
	"(" => ")",
	")" => "(",
	"[" => "]",
	"]" => "[",
	"." => "˙",
	'"' => ",,",
	"'" => ","
}

puts input.split(//).reverse.map {|l|
	subs[l].nil? ? l : subs[l]
}.join("")

Thanks!
Here is my version
https://gist.github.com/KINGSABRI/23ce8d9ba45d80939ec0dba9b3c52c1e