function GetOurAttachment(ply) // Create a selfmade function, that takes 1 argument.
local ID = ply:LookupAttachment("eyes") // this will return a number corresponding with the given attachment.
return ply:GetAttachment( ID ) // this will return a small table, see GetAttachment for more information.
end // end our function.

function GetHeadPos() // create yet another function.
LocalPlayer():ChatPrint("The position of your own head is: "..tostring(GetOurAttachment(LocalPlayer()).Pos).."!") // call our earlier function, and get the position from it so we can display it in our chat.
end // and end this one as well.