Irreplaceable.
For the simple fact that people say "To the left" far more often than people say "Ella ella ella, eh, eh, eh". I mean, there used to be a time where Rihanna references (and another popstar too, but that's besides the point

) were made all the time whenever an umbrella was pulled out, but not anymore. I can't recall the last time I've heard an Umbrella reference, whereas I still hear and say "to the left".