I (distantly) knew someone who was cutting grass on an incline adjacent to a pond. The lawnmower flipped, and it pinned him in the pond. He drowned in a foot of water and was sober.

People misjudge things all the time. I would guess it was a combination of distraction and/or non-ideal terrain (slope, dropoff, or combination).

I don’t for a fact. Relying on probability and context clues. Someone posting the question in English and using the word yard instead of garden to describe a lawn of grass isn’t from this range: https://en.m.wikipedia.org/wiki/Ornithogalum_umbellatum

Yes. Destroy with prejudice. They’re invasive, and you’ll need to get the bulb out.

It’s rampant click bait. I try not to reward the behavior with clicks, but sometimes I’m genuinely interested in the topic. This is not one of those times.