New pet peeve.
Walking down stairs behind someone who is walking downstairs very (very) slowly because their eyes are glued to their phone. Must. Not. Push. PUT YOUR FUCKING PHONE DOWN YOU FUCKING FUCK!!!
....and breathe....
For me this and variations of it is now a well-established peeve.
Over 12 years ago I was leaving a theatre but had to stop in the exit behind a woman who stood there gazing at her phone. After a few moments I politely said "excuse me". She turned, glared at me and tutted. GLARED AND TUTTED. Well that was it, all politeness instantly evaporated. I leaned forward and shouted right into her face "YOU'RE BLOCKING THE BLOODY DOOR YOU STUPID PHONE ZOMBIE".
A few years later I had the exact same exchange with someone blocking a shop door. And yes have had plenty of experiences of being stuck behind the slow-moving phone-hypnotised.
We nearly ran over someone wandering into the road, staring fixedly at their phone. It was only Mrs Backdrifter's lightning reflexes that stopped it being potentially messy.
I was heartened to read of someone so dazedly fixated on their phone they walked off the edge of a quay. I can laugh with impunity as they were unharmed while hopefully being soaked through with dirty water and feeling like a total idiot.