This is how you know.

I am staring down at my toes, the sand is warm and slightly coarse creating a tickling and yet calming sensation on the sole of my feet. The waves gently splash, playfully at my heels as though they are teasing me. My earbuds are in for my iPhone and I adjust the volume, the sound loud enough to hear my Steve Miller band "Jet Airliner" but soft enough to still hear the sound of the waves lapping behind me. I go to put the phone in my pocket and my heart dips and skips a beat when I almost lose grip and drop it on the beach--but I catch it and glance around hoping no one saw my utter clumsiness and dreading the almost possible scenario of losing the brand new iPhone I have only just gotten.
It's just then that I notice my toes are dry, the sand around me is compact hard and wet yet, untouched by water? Just as I glance behind me there is a shadow creeping up from my ankles to my waist to my shoulders and I see it--a giant wave approaching quickly from behind and I panic! Like lightning I dash forward, dare I say I flew? It was as though my feet knew no gravity and I took off but alas! The wave knew my route and crashed on me from above sending me forward and under. It lasts merely a second or two. I stand up, drenched and look around again and while there are people playing in the dunes ahead, no one has just borne witness to my experience.
And then I see it.
My iPhone.
Its orange case twinkling in the water, sun reflecting on its screen. My heart sinks, ear buds floating. It's dead.
And then I wake up.
And then I realize--I have a problem.

I just had a nightmare about my iPhone dying.