function GoGoGo()	print("executing some code") print("code code code") error("error!!")
end
script.Parent.ClickDetector.MouseClick:Connect(GoGoGo)

local clickDetector = workspace.Part.ClickDetector
function onMouseClick()	print("You clicked me!")
end
clickDetector.MouseClick:connect(onMouseClick)

function onClicked()	--code here
end
script.Parent.ClickDetector.MouseClick:Connect(onClicked)

--LUA
--put the script as a child of a part
--make a click detectora child of the same part
--get click detector refrence
local clickDetector = script.Parent.ClickDetector
--create a function to be fired when the click detector is clicked
function onMouseClick()	--put your code here	print("You clicked me!")
end
--this "connects" the event that happens when you click the click detector
--to the function above
clickDetector.MouseClick:connect(onMouseClick)