How would I make 2 lines run at once in a script?
Look up coroutines. I don't know about single lines, but you can run several bits of code at the same time in the same script this way.
coroutine.resume(coroutine.create( function() while wait() do print("hey") end end )) coroutine.resume(coroutine.create( function() while wait() do print("hi") end end )) while wait() do print("what's up") end