Visit the situation

Upon arrival, the accident occurred: a worker fell from the fourth floor of the newly built house. After the visit, the teacher focuses the students to draw lessons from this case:
- According to you, why the worker from fell?
Masa hand up:
- Dear teacher, because he does not comply with labor safety rules.
- Maybe so, anyone have any other ideas?
Kolia:
- Ladies, maybe he has a cold.
- Not exclude this possibility. Vova, what do you think?
- he fell because berated me!
- So what?
- he shouted: the other guy, do not shake the ladder!