Yeah. 'Suicide plug' Is a misnomer. Should be 'homicide plug.'
The danger isn't plugging both ends into the same circuit. The danger is when there's a downed power line, somebody plugs a generator into their outlet to power their own house. The genny backfills the line, so this line that everybody thinks is dead is suddenly live. All of a sudden the poor lineman who is trying to fix it a mile downline gets electrocuted while standing on top of a 30' ladder.
Probably not, unless one is wired incorrectly. You're just connecting hot to hot and neutral to neutral, so no power should flow.
Of course DO NOT TRY THIS. Because any mistake anyone has ever made in the electrical wiring could trigger a disaster. There is a substantially higher than zero chance you would die, and it would hurt a lot the whole time.
I'll start by saying do not do this, but even if it was wired wrong and neutral was connected to hot and everything was properly insulated, then the breaker would trigger pretty quickly since it would be a short.
If the breaker is faulty, then there could be a bigger issue, but that's fairly unlikely.
That's a valid point, if wired correctly. If not I agree the breaker should pop, but, if it doesn't yeah all hell would break loose and probably end in fire at the least.
I suspect the but am not sure that the same nothing would happen if you plugged it into a different outlet in the room. Since reason nothing happened here was claimed to be that the connections are all shared, and since outlets are wired from one outlet to the next, they would still share the hot, neutral, and ground.