mahsab

I vividly imagine someone saying "HA HA!" before running out of their car into the dark. Hours before realizing it was their car.

No invoking of "snitches get stitches" policy?

it was similar to what everyone else meant when they "got a song stuck in their head."

for me it's just a few catchy notes of melody or words of the refrain that I keep repeating (singing/whistling/humming) in my head, but certainly I don't hear the song with all the instruments etc

Well it really depends where they are from.

It may not be a life or death situation, but a thing such as broken ankle can really, really, REALLY hurt. Also any unnecessary movement can make it worse.

Since they asked generally (they asked about calling 911/112), in countries with "free" healthcare everything you mentioned (ambulance, fire department, police, ...) would be covered, so there is no worry about anything getting expensive. In such case it would make sense to call 911/112.

And if it's 3?