Lol

local maxX, maxY = term.getSize()

local tArgs = { ... }

function startRand(sX, y, letter, add)
 term.clear()
 term.setCursorPos(1,1)
 A = 0
 x = sX
 repeat
 A = A + 1
 if x == maxX then y = y + 1 x = 1 end
 for i=1,10 do
  sleep(0)
  term.setCursorPos(x,y)
  print(string.char(math.random(65, 65+25+26+5)))
 end
  term.setCursorPos(x,y)
  print(string.sub(letter, A, A))
  if add == "true" then x = x + 1 else x = sX end
 until A == #letter
end

function doRand(x, y, final)
 if string.len(final) > 1 then
  startRand(x, y, final, "true")
 else
  startRand(x, y, final, "false")
 end
end

if tArgs[1] ~= nil then
str = ""
for i,v in pairs(tArgs) do
 str = str .. tArgs[i].." "
end
elseif tArgs[1] == nil then
 write("Message: ")
 str = read()
end

if tArgs[1] ~= nil then
str = string.sub(str, 1, #str-1)
end

doRand(1,1, str) -- this runs it