The image of Russian troops pouring into Ukraine and encircling military units in Crimea has been a wake-up call that will reverberate for a generation.

Death is the final wake-up call.

It's always a wake-up call to get beaten.

Writers' bedtimes vary, but few have been spared the shock of a copy editor's early wake-up call.

It's always good to get a wake-up call and a reminder that you can't just go there and collect medals.

'Contagion' should serve as a wake-up call not only about the germs, but perhaps more importantly about the frailty of governance, nationally and worldwide.