Why isn't this one working either?

function SAM(p) p.Transparency = 1 if p.Transparency == 1 then p.Transparency = 0 else p.Transparency = 1 end end

			script.Parent.Touched:connect(SAM)
 I wanna try to make the leg dissapear then reappear

You did not make your script edited to look like a script but I'll still try. First, anything that touches the part will change. You have no waits and I believe everything is happening, but too fast to notice. Try this:

function SAM(p)
p.Transparency = 1
wait(1)
if p.Transparency == 1 then
p.Transparency = 0
end
end
script.Parent.Touched:connect(SAM)

Now, to make this not spam we use Debounce. One way to explain a Debounce is: A variable that will stop the script from being start again causing it to repeat. If you touch something, that will not count or be registered as one touch, it will be several. Here's the script with Debounce:

debounce = false -- This MUST be false or it will not allow anything to happen

function SAM(p)
	if debounce == false then -- if it's true, nothing will happen, only if debounce = false
		debounce = true -- Now this script cannot repeat when touched
		p.Transparency = 1
		wait(1)
		if p.Transparency == 1 then
			p.Transparency = 0
			wait(1) -- Waits 1 second before debounce = false
			debounce = false -- Now debounce is false; touching it again will work
		end
	end
end
script.Parent.Touched:connect(SAM)

Both should work. You will have to edit if you want more then one leg changing transparency.