I'm beginning to think I live in a parallel universe to Tom Scott, as I've never seen a Pegasus crossing, a mythical nodule on a pedestrian crossing indicator thingy, or heard a reversing wagon make white noise sounds - I've only ever heard beeping.  Or maybe I died watching YouTube and left a vestige of consciousness watching videos, whilst the world invented all these new-fangled things?  Request for a future 'Things you might not know': How to tell if you're dead.