How to make head bigger when touches?

When a player touch an brick their head of the turn bigger and big small after 12 seconds But its doesn't work what is wrong?

local ting = 0

function onTouched(hit)
    if ting == 0 then
    ting = 1
    check = hit.Parent:FindFirstChild("Humanoid")
    v=hit.Parent:FindFirstChild("Torso")

    if check ~= nil then
    function sepuku()
    script.Parent = nil
    end
if (check == nil) then sepuku() end
local head = script.Parent:FindFirstChild("Head")
if (head == nil) then sepuku() end
local m = head:FindFirstChild("Mesh")
if (m == nil) then sepuku() end
local oldColor = head.BrickColor
local oldScale = m.Scale
head.BrickColor = BrickColor.Random()
for i=1,10 do
    m.Scale = m.Scale * 1.05
    wait(.1)
end
wait(12)
for i=1,10 do
    m.Scale = m.Scale / 1.05
    wait(.1)
end
m.Scale = oldScale
head.BrickColor = oldColor

script.Parent = nil

    end
    wait(1)
    ting = 0
    end
end

script.Parent.Touched:connect(onTouched)