They’re also often used to connect a portable generator’s 120V outlet to a house’s 120V outlet, thus energizing the house circuit during a power outage. But they have no way to lock in so can fall out and become a naughty cattle prod or if the person forgot to disconnect their circuit breaker from the mains they’ll kill a person fixing the power because that lineperson won’t be expecting live wires.

Basically as you said, if you do everything right you escape with your life. But if you do it wrongk, house fire or murder!