Oh, sure, being a lumberjack or crab fisherman is dangerous, but usurping the imperial purple in Rome? That was nearly always fatal. It's a wonder anybody took the job.
Anyhow, on this date in 350 AD, a well-to-do young lad named Nepotianus, who'd had several relatives in the emperoring business, hired a bunch of gladiators and marched into Rome at their head. The timing seemed auspicious for a bit of throne-grabbing, since the general Magnentius was already in open revolt in Gaul, and our boy Nepotianus figured he had every bit as good a claim as anyone else.
Unfortunately for Nepotianus, his talent ran more towards improvisation than long range planning. Sure, everybody was running around calling themselves "Augustus" at the moment, but some royal ancestors and a platoon of gladiators were not as solid a claim on the throne as command of a major field army. By the end of June, troops loyal to general Magnentius had crushed Nepotianus' little power grab and paraded his head on a spear through the streets of Rome.