So, at what point do you go from a viewing where there's 'nothing strange happening here', to 'that's possible' to 'that's odd' to 'that's really weird and highly improbable' to ultimately 'that's impossible'. …. The car is actually being driven by a drunk driver and he hits a pedestrian killing same before crashing and totally destroying his car by driving at speed into a building. … Now you know it's a reversal because cars don't un-crash and the dead don't come back to life. …

See the rest here:
All Things Natural Philosophy: Time Reversal: Studies in Time and …