Hmm - maybe I can use it when trying to get through the pedestrians who think nothing of crossing on a red light in droves right in front of me just because I'm not a car, instead of my usual inarticulate "HEY!!aughWHADDYAjeezAAAHK!"

I think a combination of an angry glare and "HAVE A NICE DAY!!" as I barrel down on them should be suitably terrifying.